HD6432351 datasheet(488/1025 Pages) RENESAS

488 / 1025 page

Section 10 16-Bit Timer Pulse Unit (TPU)

Rev. 3.00 Sep 15, 2006 page 454 of 988

REJ09B0330-0300

10.4

Operation

10.4.1

Overview

Operation in each mode is outlined below.

Normal Operation

Each channel has a TCNT and TGR register. TCNT performs up-counting, and is also capable of

free-running operation, synchronous counting, and external event counting.

Each TGR can be used as an input capture register or output compare register.

Synchronous Operation

When synchronous operation is designated for a channel, TCNT for that channel performs

synchronous presetting. That is, when TCNT for a channel designated for synchronous operation

is rewritten, the TCNT counters for the other channels are also rewritten at the same time.

Synchronous clearing of the TCNT counters is also possible by setting the timer synchronization

bits in TSYR for channels designated for synchronous operation.

Buffer Operation

When TGR is an output compare register: When a compare match occurs, the value in the

buffer register for the relevant channel is transferred to TGR.

When TGR is an input capture register: When input capture occurs, the value in TCNT is

transfer to TGR and the value previously held in TGR is transferred to the buffer register.

Cascaded Operation

The channel 1 counter (TCNT1), channel 2 counter (TCNT2), channel 4 counter (TCNT4), and

channel 5 counter (TCNT5) can be connected together to operate as a 32-bit counter.

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