Table of Contents
Advertisement
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
6
5
CKSH2
CKSH1
0
0
W
W
Bit 4
CKSH0
Description
0
16-bit mode, counting on TCFL overflow signal
1
0
1
Use prohibited
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
0
0
W
W
Rev. 6.00, 08/04, page 257 of 628
2
1
CKSL2
CKSL1
0
0
W
W
(initial value)
(initial value)
0
CKSL0
0
W
Advertisement
Table of Contents
