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Section 9 Timers
3. Timer Control Register F (TCRF)
Bit:
7
TOLH
Initial value:
0
W
Read/Write:
TCRF is an 8-bit write-only register that switches between 16-bit mode and 8-bit mode, selects the
input clock from among four internal clock sources or external event input, and sets the output
level of the TMOFH and TMOFL pins.
TCRF is initialized to H'00 upon reset.
Bit 7: Toggle output level H (TOLH)
Bit 7 sets the TMOFH pin output level. The output level is effective immediately after this bit is
written.
Bit 7
TOLH
Description
0
Low level
1
High level
Bits 6 to 4: Clock select H (CKSH2 to CKSH0)
Bits 6 to 4 select the clock input to TCFH from among four internal clock sources or TCFL
overflow.
Bit 6
Bit 5
CKSH2
CKSH1
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
Rev. 6.00 Aug 04, 2006 page 280 of 680
REJ09B0145-0600
6
5
CKSH2
CKSH1
0
0
W
W
Bit 4
CKSH0
Description
0
16-bit mode, counting on TCFL overflow signal
1
0
1
Not available
Internal clock: counting on φ/32
0
Internal clock: counting on φ/16
1
Internal clock: counting on φ/4
0
Internal clock: counting on φw/4
1
4
3
CKSH0
TOLL
CKSL2
0
0
W
W
2
1
CKSL1
CKSL0
0
0
W
W
W
(initial value)
(initial value)
0
0
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