7630 datasheet(95/238 Pages) RENESAS

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APPLICATION

2.3 Timers

2-29

7630 Group User’s Manual

Control procedure : Figure 2.3.14 shows a control procedure.

Fig. 2.3.14 Control procedure [Measurement of frequency]

RESET

Initialization

SEI

TXM [Address: 001E16]

ICONB [Address: 000616], bit 2

CLI

CPUM [Address: 000016]

00000X002

111000002

Timer Y interrupt processing routine

CLT (Note 1)

CLD (Note 2)

Push registers to the stack area

TXH [Address: 001B16]?

Fpulse

RTI

≠ 0016

= 0016

• All interrupts : Disabled

• Timer X : Event counter mode (Count at falling edge of pulse input

from CNTR0 pin), stop counting

• Timer Y : Timer mode (

φ divided by 8 as count source), stop counting

• Interrupts : Enabled

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

Note 2: When using the Decimal mode flag (D).

• Push the registers used in the interrupt processing routine on the stack.

• Pop registers which are pushed on the stack.

X : These bits are not used in this application.

Please set these bits to “0” or “1” appropriately.

P1D [Address: 000B16]

XXX0XX002

TXL [Address: 001A16]

FF16

TXH [Address: 001B16]

0016

TYM [Address: 001F16]

1X0001XX2

TYL [Address: 001C16]

E716

TYH [Address: 001D16]

0316

IREQB [Address: 000316], bit 2

TXM [Address: 001E16], bit 7

TYM [Address: 001F16], bit 7

ICONB [Address: 000616], bit 1

• Set the Timer Y division ratio so that the Timer Y interrupt occurs every 2 ms.

• Timer Y interrupt : Enabled

• Timer X interrupt : Enabled

• Set the Timer Y interrupt request bit to “0”.

• Timer X : Start counting

• Timer Y : Start counting

D616 < TXL [Address: 001A16] < E416?

Out of range

In range

Pop registers from the stack area

Fpulse

TXL [Address: 001A16]

FF16

TXH [Address: 001B16]

0016

Processing for a result of judgment

• When the count value is 256 or more,

the processing is performed as out of range.

• Initialize the count value

• Compare the count value with the reference value

• Store the comparison result in flag Fpulse.

•

φ = f(XIN) divided by 2 (high-speed mode)

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