7480 datasheet(96/337 Pages) RENESAS

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1-79

1.12 Timer X and Timer Y

HARDWARE

7480 Group and 7481 Group User's Manual

(2)

Setting of Pulse Width Measurement Mode

Figure 1.12.17 shows the setting of the pulse width measurement mode.

Timer X count stop (when timer X is used)

Timer Y count stop (when timer Y is used)

Procedure 1 Stop of timer count

Timer XY control register (TXYCON) [Address 00F816]

Pulse width measurement mode

Procedure 3 Setting timer mode register

Timer X mode register (TXM) [Address 00F616]

• when timer X is used

Timer X count source selection

00: f(XIN)/2

01: f(XIN)/8

10: f(XIN)/16

11: Not available

Pulse width measurement mode

Timer Y mode register (TYM) [Address 00F716]

• when timer Y is used

Timer Y count source selection

00: f(XIN)/2

01: f(XIN)/8

10: f(XIN)/16

11: Not available

: ‘Not implemented’.

Note: In the 7480 Group, these bits are not implemented.

Port P40 input mode (when timer X is used)

Port P41 input mode (when timer Y is used)

Port P4 direction register (P4D) [Address 00C916]

Procedure 2 Setting CNTR pin input

1. Setting port pin which has the alternative function of CNTR pin to input mode

CNTR0 edge polarity selection (when timer X is used)

CNTR1 edge polarity selection (when timer Y is used)

0: CNTR pin input from rising to falling (HIGH-level period) is counted

1: CNTR pin input from falling to rising (LOW-level period) is counted

Edge polarity selection register (EG) [Address 00D416]

2. Setting edge polarity selection register

(Note)

Timer XY control register (TXYCON) [Address 00F816]

Timer X count start (when timer X is used)

Timer Y count start (when timer Y is used)

Procedure 4 Start of timer count

Figure 1.12.17 Setting of Pulse Width Measurement Mode

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