M38047FEHKP datasheet(167/387 Pages) RENESAS

167 / 387 page

2-43

APPLICATION

2.3 Timer

Rev.1.00 Jan 14, 2005

REJ09B0212-0100Z

3804 Group (Spec.H)

Fig. 2.3.27 Control procedure (1)

P4D

TZM

TYZCSS

TZL

TZH

INTSEL

IREQ1

ICON1

IREQ2

ICON2

TZM

CLI

(address 000916)

(address 002A16)

(address 000F16)

(address 002816)

(address 002916)

(address 003916)

(address 003C16), bit0

(address 003E16), bit0

(address 003D16), bit5

(address 003F16), bit5

(address 002A16), bit6

RESET

SEI

0XXXXXXX2

RTI

Error processing

X10X00112

0011XXXX2

FF16

XXX1XXX12

•All interrupts disabled

•Set P47/CNTR2 pin to input mode

•Timer Z: Pulse width measurement mode

(Measure “H” level of pulses input from CNTR2 pin.)

•Set timer Z initial value

•Timer Z interrupt enabled

•CNTR2 interrupt enabled

•Timer Z count start

•Interrupts enabled

Note 1: When using Index X mode flag (T)

Note 2: When using Decimal mode flag (D)

•Push registers used in interrupt process routine

•Pop registers pushed to stack

Pop registers

Initialization

CLT (Note 1)

CLD (Note 2)

Push registers to stack

Timer Z interrupt process routine

q x: This bit is not used here. Set it to “0” or “1” arbitrarily.

Note: Timer Z interrupt also occurs owing to factors other than measurement level.

(CNTR2 input =“L” in this application)

Process it by software as error processing is performed for measurement level as necessary.

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

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