H838024 datasheet(298/697 Pages) RENESAS

298 / 697 page

Section 9 Timers

Rev. 7.00 Mar 10, 2005 page 256 of 652

REJ09B0042-0700

Bits 6 and 5—Counter Up/Down Control (TMC6, TMC5)

Selects whether TCC up/down control is performed by hardware using UD pin input, or whether

TCC functions as an up-counter or a down-counter.

Bit 6

TMC6

Bit 5

TMC5

Description

TCC is an up-counter

(initial value)

TCC is a down-counter

Hardware control by UD pin input

UD pin input high: Down-counter

UD pin input low: Up-counter

*: Don't care

Bits 4 and 3—Reserved

Bits 4 and 3 are reserved; they are always read as 1 and cannot be modified.

Bits 2 to 0—Clock Select (TMC2 to TMC0)

Bits 2 to 0 select the clock input to TCC. For external event counting, either the rising or falling

edge can be selected.

Bit 2

TMC2

Bit 1

TMC1

Bit 0

TMC0

Description

Internal clock:

φ/8192

(initial value)

Internal clock:

φ/2048

Internal clock:

φ/512

Internal clock:

φ/64

Internal clock:

φ/16

Internal clock:

φ/4

Internal clock:

W/4

External event (TMIC): rising or falling edge*

Note: * The edge of the external event signal is selected by bit IEG1 in the IRQ edge select

in port mode register B (PMRB) must be set to 1 before setting 111 in bits TMC2 to TMC0.

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