7480 datasheet(228/337 Pages) RENESAS

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7480 Group and 7481 Group User's Manual

2-13

APPLICATIONS

Figure 2.2.13 Communications Control Procedure Example

2.2 Timer X and Timer Y

Initialize

CNTR0 interrupt service routine

Read value from timer X ?

←0

←1

rCOUNT = 8 ?

rWORK

←0016

rDATA

←rWORK

Processing against

error generation

ROR rWORK

rWORK(Internal RAM)

rCOUNT

←rCOUNT + 1

rCOUNT

←0016

RTI

006416 through 00C716 (Note 3)

012C16 through018F16 (Note 4)

01F416 through 025716 (Note 5)

02BC16 through 031F16 (Note 6)

Others

Timer X interrupt service routine processing

RTI

Error-recovery processing

Timer X is read out (Note 2).

Set timer X mode register

TXM(Address 00F616)

Pulse width measurement mode

RESET(Note 1)

Set timer XY control register

TXYCON(Address 00F816)

Timer X count start

SEI

Timer X count source: f(XIN)/8

Timer X interrupt request bit

← 0

CNTR0 interrupt request bit

← 0

Timer X interrupt enable bit

← 1

CNTR0 interrupt enable bit

← 1

CLI

×× 01 1

rDATA

rWORK

rCOUNT

: Carry Flag

: RAM for received data (1 byte)

: RAM for receiving data (2 bytes)

: RAM for counting data (1 byte)

CNTR0 edge selection bit

← 0(HIGH width measured)

Notes 1: After system is released from reset

• Timer X stop control bit = 1 (count stopped)

• CNTR0 edge selection bit = 0 (HIGH pulse width measured)

• Pin P40/CNTR0: input mode

2: Read from timer X in order of high-order to low-order byte.

3: 100 to 199 (Data pulse ‘0’)

4: 300 to 399 (Data pulse ‘1’)

5: 500 to 599 (Start pulse)

6: 700 to 799 (Stop pulse)

Port P40 (alternative function of CNTR0) is set to input.

RTI

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