7630 datasheet(99/238 Pages) RENESAS

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APPLICATION

2.3 Timers

2-33

7630 Group User’s Manual

Fig. 2.3.18 Control procedure [Measurement of pulse width] (2)

CNTR0 interrupt processing routine (Note 2)

RTI

CLT (Note 3)

CLD (Note 4)

Push registers to the stack area

Note 3: When using the Index X mode flag (T).

Note 4: When using the Decimal mode flag (D).

• Push the registers used in the interrupt processing routine

on the stack.

• Pop registers which is pushed on the stack.

Pop registers from the stack area

RAM for high-order 8-bit

of a measurement result

TXH

Note 2: The first measurement with Timer X is invalid as shown in the following figure.

• A complemented count value is read out and stored to RAM.

Example: 1. Make sure to start the Timer X count at “L” level of the CNTR0 input signal.

(A level of the CNTR0 input signal is judged by reading a content of the Port

P14 register.

2. Be sure to invalidate the first CNTR0 interrupt after starting the Timer X count.

[When the Timer X count is started at “H” level of the CNTR0 input signal]

Start

Timer X

000016

FFFF16

Timer X

CNTR0 input

A measurement result: Invalid

A measurement result: Valid

CNTR0 interrupt

[When the Timer X count is started at “L” level of the CNTR0 input signal]

Start

Timer X

000016

FFFF16

Timer X

CNTR0 input

A measurement result: Valid

CNTR0 interrupt

RAM for low-order 8-bit

of a measurement result

TXL

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