H8SSLASH2225 datasheet(538/1071 Pages) RENESAS

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Section 12 8-Bit Timers

Rev. 5.00 Aug 08, 2006 page 452 of 982

REJ09B0054-0500

Bit

Bit Name

Initial

Value

R/W

Description

OS3

OS2

R/W

Output Select 3 and 2

These bits specify how the timer output level is to be

changed by a compare-match B of TCORB and

TCNT.

00: No change when compare-match B occurs

01: 0 is output when compare-match B occurs

10: 1 is output when compare-match B occurs

11: Output is inverted when compare-match B occurs

(toggle output)

OS1

OS0

R/W

Output Select 1 and 0

These bits specify how the timer output level is to be

changed by a compare-match A of TCORA and

TCNT.

00: No change when compare-match A occurs

01: 0 is output when compare-match A occurs

10: 1 is output when compare-match A occurs

11: Output is inverted when compare-match A occurs

(toggle output)

Notes: 1. Not available in the H8S/2237 Group and H8S/2227 Group.

2. Only 0 can be written to this bit, to clear the flag.

12.4

Operation

12.4.1

Pulse Output

Figure 12.2 shows an example of arbitrary duty pulse output.

1. Set TCR in CCR1 to 0 and CCLR0 to 1 to clear TCNT by a TCORA compare-match.

2. Set OS3 to OS0 bits in TCSR to B'0110 to output 1 by a compare-match A and 0 by compare-

match B.

By the above settings, waveforms with the cycle of TCORA and the pulse width of TCRB can be

output without software intervention.

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