Tandy 200 Timer - Revision history

Jhoger: /* RP5C01: Real Time Clock with Internal RAM */

2009-03-19T21:47:40Z

RP5C01: Real Time Clock with Internal RAM

← Older revision		Revision as of 14:47, 19 March 2009
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	From the [[Media:Rp5c01 T200 timer.pdf\|Datasheet]]:		From the [[Media:Rp5c01 T200 timer.pdf\|Datasheet]]:

	"The RP/RF5C01A are real-time clocks for microcomputers that can be connected directly to buses of ~~microcom-~~		"The RP/RF5C01A are real-time clocks for microcomputers that can be connected directly to buses of microcomputers with such CPUs as the 8085A or Z80 and allow setting or reading of the clock with the same procedures as
	~~puters~~ with such CPUs as the 8085A or Z80 and allow setting or reading of the clock with the same procedures as
	for the Read/Write operation for memory.		for the Read/Write operation for memory.

2009-03-19T21:47:30Z

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 It is not complete yet
 == Interaction Between Timer and Memory Subsystem ==
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 E14H  (DBH) IN D8H		; GET CURRENT BANK DATA
 E16H  (D3H) OUT 90H		; STORE 4 BITS IN THE RAM LOCATION 0
 [[Category:Model T Developer Reference]]

2009-03-19T21:46:29Z

Accessing the Timer in the T200

← Older revision		Revision as of 14:46, 19 March 2009
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	It is not complete yet		It is not complete yet

	== ~~Accessing the~~ Timer ~~in the T200~~ ==		== Interaction Between Timer and Memory Subsystem ==

	The timer is accessible via port 9X. The code below illustrates how to change the mode on the timer to allow RAM access.		The timer is accessible via port $9X.

			Uniquely on the T200, the timer is used as scratchpad for copying data from bank to bank in the memory subsystem.

			The code below illustrates how to change the mode on the timer to allow RAM access.

	2E0CH (DBH) IN 9DH ; get current TIMER CHIP MODE		2E0CH (DBH) IN 9DH ; get current TIMER CHIP MODE
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	Now the timer is ready to be read/written. Note, the typical value for port 9D is 1000b or 8d.		Now the timer is ready to be read/written. Note, the typical value for port $9D is 1000b or 8d.

	Port 90 is used to store the source bank location, and port 91 is used to store the target.		Port $90 is used to store the source bank location, and port $91 is used to store the target.

			ex.

	~~ex.~~
	2E14H (DBH) IN D8H ; GET CURRENT BANK DATA		2E14H (DBH) IN D8H ; GET CURRENT BANK DATA
	2E16H (D3H) OUT 90H ; STORE 4 BITS IN THE RAM LOCATION 0		2E16H (D3H) OUT 90H ; STORE 4 BITS IN THE RAM LOCATION 0



	== RP5C01: Real Time Clock with Internal RAM ==		== RP5C01: Real Time Clock with Internal RAM ==

2009-03-19T17:15:50Z

Remote block copy code at 2FC5

← Older revision		Revision as of 10:15, 19 March 2009
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	2E16H (D3H) OUT 90H ; STORE 4 BITS IN THE RAM LOCATION 0		2E16H (D3H) OUT 90H ; STORE 4 BITS IN THE RAM LOCATION 0

	~~== Remote block copy code at 2FC5 ==~~
	~~; this routine copies B bytes from (HL) in source to (DE) in target~~
	~~; enter with source RAM visible~~

	~~2FC5H (C5H) PUSH B~~
	~~2FC6H (46H) MOV B,M ; load B with (HL)~~
	~~2FC7H (DBH) IN 91H ; get target data~~
	~~2FC9H (D3H) OUT D8H ; switch to target~~
	~~2FCBH (78H) MOV A,B ;~~
	~~2FCCH (12H) STAX D ; store (HL) in (DE)~~
	~~2FCDH (DBH) IN 90H~~
	~~2FCFH (D3H) OUT D8H ; switch to source~~
	~~2FD1H (C1H) POP B~~
	~~2FD2H (23H) INX H~~
	~~2FD3H (13H) INX D~~
	~~2FD4H (0BH) DCX B ; decrement BC~~
	~~2FD5H (79H) MOV A,C ;~~
	~~2FD6H (B0H) ORA B~~
	~~2FD7H (C2H) JNZ 2FC5H ; loop back until B copies are performed....~~
	~~2FDAH (C9H) RET~~

	== RP5C01: Real Time Clock with Internal RAM ==		== RP5C01: Real Time Clock with Internal RAM ==

2009-03-19T17:14:10Z

Accessing the Timer in the T200

← Older revision		Revision as of 10:14, 19 March 2009
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	The timer is accessible via port 9X. The code below illustrates how to change the mode on the timer to allow RAM access.		The timer is accessible via port 9X. The code below illustrates how to change the mode on the timer to allow RAM access.

	2E0CH (DBH) IN 9DH ; get current TIMER CHIP MODE		2E0CH (DBH) IN 9DH ; get current TIMER CHIP MODE
			2E0EH (E6H) ANI 0CH ; and with 0c
	2E0EH (E6H) ANI 0CH ; and with 0c		2E10H (F6H) ORI 02H ; or with 02
			2E12H (D3H) OUT 9DH ; SET TIMER CHIP MODE- LEAVE ALARMS ALONE, BUT SET TO RAM MODE
	2E10H (F6H) ORI 02H ; or with 02

	2E12H (D3H) OUT 9DH ; SET TIMER CHIP MODE- LEAVE ALARMS ALONE, BUT SET TO RAM MODE


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	Port 90 is used to store the source bank location, and port 91 is used to store the target.		Port 90 is used to store the source bank location, and port 91 is used to store the target.

	ex.		ex.
			2E14H (DBH) IN D8H ; GET CURRENT BANK DATA
	2E14H (DBH) IN D8H ; GET CURRENT BANK DATA		2E16H (D3H) OUT 90H ; STORE 4 BITS IN THE RAM LOCATION 0

	2E16H (D3H) OUT 90H ; STORE 4 BITS IN THE RAM LOCATION 0

	== Remote block copy code at 2FC5 ==		== Remote block copy code at 2FC5 ==

2009-03-19T17:13:28Z

Remote block copy code at 2FC5

@@ Line 29: / Line 29: @@
 == Remote block copy code at  2FC5 ==
-; this routine copies B bytes from (HL) in source to (DE) in target
+ ; this routine copies B bytes from (HL) in source to (DE) in target
-; enter with source RAM visible
+ ; enter with source RAM visible
 == RP5C01: Real Time Clock with Internal RAM ==

2009-03-19T17:01:39Z

Accessing the Timer in the T200

← Older revision		Revision as of 10:01, 19 March 2009
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	ex.		ex.

	2E14H (DBH) IN D8H ; GET CURRENT BANK DATA		2E14H (DBH) IN D8H ; GET CURRENT BANK DATA

	2E16H (D3H) OUT 90H ; STORE 4 BITS IN THE RAM LOCATION 0		2E16H (D3H) OUT 90H ; STORE 4 BITS IN THE RAM LOCATION 0

2009-03-19T17:01:19Z

Accessing the Timer in the T200

2009-03-19T17:00:35Z

Accessing the Timer in the T200

← Older revision		Revision as of 10:00, 19 March 2009
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	== Accessing the Timer in the T200 ==		== Accessing the Timer in the T200 ==
			<nowiki>
	"The timer is accessible via port 9X. The code below illustrates how to change the mode on the timer to allow RAM access.		The timer is accessible via port 9X. The code below illustrates how to change the mode on the timer to allow RAM access.

	2E0CH (DBH) IN 9DH ; get current TIMER CHIP MODE		2E0CH (DBH) IN 9DH ; get current TIMER CHIP MODE
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	2E14H (DBH) IN D8H ; GET CURRENT BANK DATA		2E14H (DBH) IN D8H ; GET CURRENT BANK DATA
	2E16H (D3H) OUT 90H ; STORE 4 BITS IN THE RAM LOCATION 0		2E16H (D3H) OUT 90H ; STORE 4 BITS IN THE RAM LOCATION 0
	"
			</nowiki>

	== Remote block copy code at 2FC5 ==		== Remote block copy code at 2FC5 ==

2009-03-19T17:00:05Z

Accessing the Timer in the T200

← Older revision		Revision as of 10:00, 19 March 2009
Line 7:		Line 7:
	== Accessing the Timer in the T200 ==		== Accessing the Timer in the T200 ==

	The timer is accessible via port 9X. The code below illustrates how to change the mode on the timer to allow RAM access.		"The timer is accessible via port 9X. The code below illustrates how to change the mode on the timer to allow RAM access.

	2E0CH (DBH) IN 9DH ; get current TIMER CHIP MODE		2E0CH (DBH) IN 9DH ; get current TIMER CHIP MODE
Line 21:		Line 21:
	2E14H (DBH) IN D8H ; GET CURRENT BANK DATA		2E14H (DBH) IN D8H ; GET CURRENT BANK DATA
	2E16H (D3H) OUT 90H ; STORE 4 BITS IN THE RAM LOCATION 0		2E16H (D3H) OUT 90H ; STORE 4 BITS IN THE RAM LOCATION 0
			"

	== Remote block copy code at 2FC5 ==		== Remote block copy code at 2FC5 ==