HD6473887 Datasheet, PDF (219/523 Pages) Renesas Technology Corp – Hitachi 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 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
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
Not available
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)
*: Don't care
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