Section 9 Timers
Rev. 6.00 Aug 04, 2006 page 271 of 680
REJ09B0145-0600
4. Clock Stop Register 1 (CKSTPR1)
S1CKSTP
TFCKSTP TCCKSTP TACKSTP
S31CKSTP S32CKSTP ADCKSTP TGCKSTP
7
6
5
4
3
2
1
0
1
1
1
1
1
1
1
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit:
Initial value:
Read/Write:
CKSTPR1 is an 8-bit read/write register that performs module standby mode control for peripheral
modules. Only the bit relating to timer C is described here. For details of the other bits, see the
sections on the relevant modules.
Bit 1:
Timer C module standby mode control (TCCKSTP)
Bit 1 controls setting and clearing of module standby mode for timer C.
TCCKSTP
Description
0
Timer C is set to module standby mode
1
Timer C module standby mode is cleared
(initial value)
9.3.3
Timer Operation
1. Interval Timer Operation
When bit TMC7 in timer mode register C (TMC) is cleared to 0, timer C functions as an 8-bit
interval timer.
Upon reset, TCC is initialized to H'00 and TMC to H'18, so TCC continues up-counting as an
interval up-counter without halting immediately after a reset. The timer C operating clock is
selected from seven internal clock signals output by prescalers S and W, or an external clock input
at pin TMIC. The selection is made by bits TMC2 to TMC0 in TMC.
TCC up/down-count control can be performed either by software or hardware. The selection is
made by bits TMC6 and TMC5 in TMC.
After the count value in TCC reaches H'FF (H'00), the next clock input causes timer C to overflow
(underflow), setting bit IRRTC to 1 in IRR2. If IENTC = 1 in interrupt enable register 2 (IENR2),
a CPU interrupt is requested.
At overflow (underflow), TCC returns to H'00 (H'FF) and starts counting up (down) again.
Summary of Contents for H8/38342
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Page 76: ...Section 1 Overview Rev 6 00 Aug 04 2006 page 38 of 680 REJ09B0145 0600...
Page 240: ...Section 7 RAM Rev 6 00 Aug 04 2006 page 202 of 680 REJ09B0145 0600...
Page 468: ...Section 12 A D Converter Rev 6 00 Aug 04 2006 page 430 of 680 REJ09B0145 0600...
Page 580: ...Section 15 Electrical Characteristics Rev 6 00 Aug 04 2006 page 542 of 680 REJ09B0145 0600...