HD6433636SW datasheet(186/418 Pages) RENESAS

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172

Timer Control Register F (TCRF)

Bit

76543210

TOLH

CKSH2

CKSH1

CKSH0

TOLL

CKSL2

CKSL1

CKSL0

Initial value

00000000

Read/Write

WWWWWWWW

TCRF is an 8-bit write-only register. It is used to switch between 16-bit mode and 8-bit mode, to

select among four internal clocks and an external event, and to select the output level at pins

TMOFH and TMOFL.

Upon reset, TCRF is initialized to H'00.

Bit 7—Toggle Output Level H (TOLH): Bit 7 sets the output level at pin TMOFH. The setting

goes into effect 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 input to TCFH from four

internal clock signals or the overflow of TCFL.

Bit 6: CKSH2

Bit 5: CKSH1

Bit 4: CKSH0

Description

16-bit mode selected. TCFL overflow signals

are counted.

(initial value)

Internal clock: ø/32

Internal clock: ø/16

Internal clock: ø/4

Internal clock: ø/2

Note: * Don’t care

Bit 3—Toggle Output Level L (TOLL): Bit 3 sets the output level at pin TMOFL. The setting

goes into effect immediately after this bit is written.

Bit 3: TOLL

Description

Low level

(initial value)

High level

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