M38047FEHKP datasheet(168/387 Pages) RENESAS

168 / 387 page

2-44

APPLICATION

2.3 Timer

Rev.1.00 Jan 14, 2005

REJ09B0212-0100Z

3804 Group (Spec.H)

Fig. 2.3.28 Control procedure (2)

RTI

(A)

Measurement result (high-order 8 bits)

(A)

Measurement result (low-order 8 bits)

TZH

(A)

TZL

(A)

FFFF16

000016

Count start of

Timer Z

T1 value: Valid

CNTR2

FFFF16

000016

CNTR2

CNTR2 interrupt process routine (Note 1)

CLT (Note 2)

CLD (Note 3)

Push registers to stack

Pop registers

Notes 2: When using Index X mode flag (T)

3: When using Decimal mode flag (D)

•Pushing registers used in interrupt process routine

•Popping registers pushed to stack

•Count value read and storing it to RAM

Note 1: The first value becomes invalid depending on start timing of Timer Z count shown

by the following figure.

Process it by software as necessary.

[ Example 1] • Start Timer Z count when CNTR2 input level is “L”.

(CNTR2 input level can be checked by reading the contents of sharing port P47 register.)

CNTR2 interrupt

T2 value: Valid

CNTR2 interrupt

[ Example 2] • Start Timer Z count when CNTR2 input level is “H”.

Invalidate the first CNTR2 interrupt after start of Timer Z count.

Count start of

Timer z

T1 value: Invalid

CNTR2 interrupt

T2 value: Valid

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