GMS84512 Datasheet, PDF (44/123 Pages) Hynix Semiconductor – 8-BIT SINGLE CHIP MICROCOMPUTER

GMS 84512 / 84524
3.3 TIMER
Timer of GMS84512/84524 is 8-bit binary counter is consisted of Timer0(T0). Timer1(T1), Timer2(T2),
Timer(T3), Timer Data Register(TDR0~TDR3). Timer Mode Register(TM0, TM2) and control circuit.
T0, T1 is each 8-bit interval Timer and can be used as a 16-bit intrval Timer.
T2, T3 is each 8-bit interval timer/event counter and can be used as a 16-bit interval timer/event counter
3.3.1 OPERATION MODE OF TIMER
l Operating mode of T0, T1
T0
T1
l 8-bit Interval Timer
l 8-bit Interval Timer
l 16-bit Interval Timer
l Operating mode ofT2, T3
T2
T3
-. 8-bit Interval Timer
-. 8-bit Interval Timer
-. 8-bit Event Counter
-. 8-bit Event Counter
-. 16-bit Interval Timer
-. 16-bit Event Counter
When T2, T3 are used as event counter the relevant Port Mode Register Value should be
assigned to select EC2 or EC3.
When T2, T3 are used as event counter, TDR value should be initialized to “FFH” because
Timer count value is cleared if it equals to TDR value
Note) At the Reset Routine, TDR0 ~ TDR3 are should be initialized by software. (Except 00H)
PORT FUNCTION SELECTION REGISTER
FUNC
<00CA_H>
-
-
-
W
W
W
W
W
7
6
5
4
3
2
1
0
Initial value (When MCU Reset
-
-
- EC3S EC2S INT3S INT2S INT1S
[ ---0 0000 ]
R27 / EC3 Selection
0 : R27 ( I/O )
1 : EC3 ( Input )
R26 / EC2 Selection
0 : R26 ( I/O )
1 : EC2 ( Input )
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