hd64338023s Renesas Electronics Corporation., hd64338023s Datasheet - Page 308

• Manufacturer Part Number: hd64338023s
• Description: Renesas 8-bit Single-chip Microcomputer Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

Section 9 Timers
Timer Control Register F (TCRF)
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
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
Rev. 7.00 Mar 10, 2005 page 266 of 652
REJ09B0042-0700
Bit:
Initial value:
Read/Write:
Bit 5
CKSH1
0
0
1
1
0
0
1
1
Description
Low level
High level
TOLH
W
7
0
Bit 4
CKSH0
0
1
0
1
0
1
0
1
CKSH2
W
6
0
Description
16-bit mode, counting on TCFL overflow signal
Use prohibited
Internal clock: counting on φ/32
Internal clock: counting on φ/16
Internal clock: counting on φ/4
Internal clock: counting on φw/4
CKSH1
W
5
0
CKSH0
W
4
0
TOLL
W
3
0
CKSL2
W
2
0
CKSL1
W
1
0
(initial value)
(initial value)
CKSL0
W
0
0