7733 datasheet(465/940 Pages) RENESAS

465 / 940 page

APPLICATIONS

7733 Group User’s Manual

17–57

(4) Approximate flowchart

Fig. 17.5.5 Approximate flowchart

Clock prescaler is initialized.

A value of “8016” is written to address 6F 16 by executing the LDM instruction.

Main routine

INT0 interrupt control register

“11 16”

(address 7D16)

Oscillation circuit control register (address 6F 16)

“8016”

Count start flag (address 40 16)

“C016”

Timer B2 interrupt routine

Count-up processing for clock

RTI

Counted up every minute

INT0 interrupt routine

INT0 level/edge selection bit = “?”

(bit 4 at address 7D 16)

Timer B1 count start flag

“0”

(bit 6 at address 40 16)

By setting interrupt priority level, interrupts

other than INT 0 are disabled.

System clock stop bit at wait state

(bit 5 at address 6C 16)

“1”

Timer B1 count start flag

“1 ”

(bit 6 at address 40 16)

Timer B1 register

FFFF 16

(addresses 5316 and 5216)

Timer B1 count start flag

“0”

(bit 6 at address 40 16)

Timer B1 register

FFFE 16

(addresses 5316 and 5216)

Timer B1 count start flag

“1”

(bit 6 at address 40 16)

Make INT0 interrupt priority level higher.

WIT instruction

Make INT0 interrupt priority level to the

former level.

RTI

INT0 interrupt control register

(address 7D16)

“01 16”

Timer B1 interrupt request bit = ?

(bit 3 at address 7B 16)

Count value of timers B1 and B2

Clock counter

Display urging user to set time again

INT0 interrupt polarity is

selected.

(Falling edge: “H”

“L”)

INT0 interrupt polarity is

selected.

(Rising edge: “L”

“H”)

Counting for timer B1 stops.

Counting for timer B1 starts.

Counting for timer B1 stops.

0: No request

1: Requested

1: Rising edge (“L”

“H”)

0: Falling edge (“H”

“L”)

Count start flag

Counting for timers B1 and B2 start

1: Requested

g By software initial settings, interrupt priority level is set as follows:

q Timer B2 < INT0

Counting for timer B1 starts.

Timer B2 interrupt request bit = ?

(bit 3 at address 7C 16)

17.5 Timer B

7733 데이터시트(PDF) 465 Page - Renesas Technology Corp

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