Datasheet

Section 15 Timer RC

REJ09B0465-0300 Rev. 3.00 Page 465 of 982

Sep 17, 2010

H8S/20103, H8S/20203, H8S/20223, H8S/20115, H8S/20215, H8S/20235 Group

Table 15.6 FTIOD Pin Functions

Name TRCOER TRCMR TRCIOR1

Bit Name ED PWM2 PWMD

IOD2 to

IOD0 Function

0 1 1 XXX PWM mode waveform output

0 1 0 001, 01X Timer mode waveform output (output

compare function)

X 1 0 1XX Timer mode (input capture function)

X 1 0 000 General input port (when PCR = 0 on

the corresponding pin)

Setting

values

Other than above Setting prohibited

[Legend]

X: Don't care.

15.3.1 Timer Mode Operation

TRCCNT performs free-running or periodic counting operations. After a reset, TRCCNT is set as

a free-running counter. When the CTS bit in TRCMR is set to 1, TRCCNT starts counting. When

the TRCCNT value overflows from H'FFFF to H'0000, the OVF flag in TRCSR is set to 1. If the

OVIE in TRCIER is set to 1, an interrupt request is generated. Figure 15.2 shows an example of

free-running counting.

TRCCNT

H'FFFF

H'0000

CTS bit

OVF

Time

Flag cleared

by software

Figure 15.2 Free-Running Counter Operation