HD6433802H Datasheet, PDF (201/435 Pages) Hitachi Semiconductor – Single-Chip Microcomputer

3. Timer control register F (TCRF)
Bit:
Initial value:
Read/Write:
7
TOLH
0
W
6
CKSH2
0
W
5
CKSH1
0
W
4
CKSH0
0
W
3
TOLL
0
W
2
CKSL2
0
W
1
CKSL1
0
W
0
CKSL0
0
W
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 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
0
1
Description
Low level
High level
(initial value)
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
0
0
0
0
1
1
1
1
Bit 5
CKSH1
0
0
1
1
0
0
1
1
Bit 4
CKSH0
0
1
0
1
0
1
0
1
Description
16-bit mode, counting on TCFL overflow signal
Use prohibited
Internal clock: counting on ø/32
Internal clock: counting on ø/16
Internal clock: counting on ø/4
Internal clock: counting on øw/4
(initial value)
183