7480 datasheet(93/337 Pages) RENESAS

93 / 337 page

1-76

1.12 Timer X and Timer Y

HARDWARE

7480 Group and 7481 Group User's Manual

(2)

Setting of Pulse Period Measurement Mode

Figure 1.12.15 shows the setting of the pulse period measurement mode.

Figure 1.12.15 Setting of Pulse Period 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 period 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 period 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 falling to falling is counted

1: CNTR pin input from rising to rising 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

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