H8SSLASH2225 datasheet(483/1071 Pages) RENESAS

483 / 1071 page

Section 11 16-Bit Timer Pulse Unit (TPU)

Rev. 5.00 Aug 08, 2006 page 397 of 982

REJ09B0054-0500

11.3.9

Timer Synchronous Register (TSYR)

In the H8S/2227 Group, TSYR selects independent or synchronous TCNT operation for channels

0 to 2. In other groups, TSYR selects independent or synchronous TCNT operation for channels 0

to 5. A channel performs synchronous operation when the corresponding bit in TSYR is set to 1.

Bit

Bit Name

Initial value

R/W

Description

7, 6

—

All 0

R/W

Reserved

The write value should always be 0.

SYNC5*

SYNC4*

SYNC3*

SYNC2

SYNC1

SYNC0

R/W

Timer Synchronization 5 to 0

These bits select whether operation is independent of

or synchronized with other channels.

When synchronous operation is selected,

synchronous presetting of multiple channels, and

synchronous clearing through counter clearing on

another channel are possible.

To set synchronous operation, the SYNC bits for at

least two channels must be set to 1. To set

synchronous clearing, in addition to the SYNC bit, the

TCNT clearing source must also be set by means of

bits CCLR2 to CCLR0 in TCR.

0: TCNT_5 to TCNT_0 operates independently

(TCNT presetting /clearing is unrelated to

other channels)

1: TCNT_5 to TCNT_0 performs synchronous

operation (TCNT synchronous presetting/

synchronous clearing is possible)

Note:

* In the H8S/2227 Group, bits 5 to 3 are reserved. The write value should always be 0.

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