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2. Timer counter A (TCA)
Bit
TCA7
Initial value
Read/Write
R
TCA is an 8-bit read-only up-counter, which is incremented by internal clock input. The clock
source for input to this counter is selected by bits TMA3 to TMA0 in timer mode register A
(TMA). TCA values can be read by the CPU in active mode, but cannot be read in subactive
mode. When TCA overflows, the IRRTA bit in interrupt request register 1 (IRR1) is set to 1.
TCA is cleared by setting bits TMA3 and TMA2 of TMA to 11.
Upon reset, TCA is initialized to H'00.
3. Clock stop register 1 (CKSTPR1)
Bit:
7
—
Initial value:
1
Read/Write:
R/W
CKSTPR1 is an 8-bit read/write register that performs module standby mode control for peripheral
modules. Only the bit relating to timer A is described here. For details of the other bits, see the
sections on the relevant modules.
Bit 0: Timer A module standby mode control (TACKSTP)
Bit 0 controls setting and clearing of module standby mode for timer A.
TACKSTP
Description
0
Timer A is set to module standby mode
1
Timer A module standby mode is cleared
7
6
5
TCA6
TCA5
0
0
0
R
R
6
5
S31CKSTP S32CKSTP ADCKSTP TGCKSTP
1
1
R/W
R/W
4
3
TCA4
TCA3
TCA2
0
0
R
R
4
3
TFCKSTP TCCKSTP TACKSTP
1
1
R/W
R/W
2
1
TCA1
TCA0
0
0
R
R
2
1
1
1
R/W
R/W
(initial value)
0
0
R
0
1
R/W
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