Datasheet

Section 9 Timers
Rev. 6.00 Aug 04, 2006 page 280 of 680
REJ09B0145-0600
3. Timer Control Register F (TCRF)
TOLH CKSL2 CKSL1 CKSL0CKSH2 CKSH1 CKSH0 TOLL
76543210
0
0000000
W
WWW
WWW
W
Bit:
Initial value:
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 (initial value)
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
CKSH2
Bit 5
CKSH1
Bit 4
CKSH0 Description
0 0 0 16-bit mode, counting on TCFL overflow signal (initial value)
001
010
0 1 1 Not available
1 0 0 Internal clock: counting on φ/32
1 0 1 Internal clock: counting on φ/16
1 1 0 Internal clock: counting on φ/4
1 1 1 Internal clock: counting on φw/4