H838024 datasheet(308/697 Pages) RENESAS

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Section 9 Timers

Rev. 7.00 Mar 10, 2005 page 266 of 652

REJ09B0042-0700

Timer Control Register F (TCRF)

TOLH

CKSL2

CKSL1

CKSL0

CKSH2

CKSH1

CKSH0

TOLL

543210

0000000

WWW

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

Low level

(initial value)

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

16-bit mode, counting on TCFL overflow signal

(initial value)

001

010

011Use prohibited

100Internal clock: counting on

φ/32

101Internal clock: counting on

φ/16

110Internal clock: counting on

φ/4

111Internal clock: counting on

φw/4

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