7733 datasheet(453/940 Pages) RENESAS

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APPLICATIONS

7733 Group User’s Manual

17–46

Fig. 17.4.2 Approximate flowchart

17.4 Power saving

(3) Approximate flowchart

Interrupts other than a key input interrupt

are disabled.

Notes 1: When pin VREF and resistor ladder network are connected, current flows into the resistor ladder network.

When using the A-D converter after the stop mode is terminated, do as follows:

qReconnect pin VREF and resistor ladder network.

w And then, start A-D conversion after a period of 1 µs or more passed.

When a port is connected to an external device and so on, there is a possibility that current consumption

increases according to the port’s level. In order to avoid this problem, do as follows:

•When output mode is selected: Fix the port’s level to a level where no current flows into the external.

•When input mode is selected : Pull the port high or low via a resistor. (Floating state is disabled.)

Key input interrupt

request occurs.

(Key is pushed.)

Main routine

STP

VREF connection selection bit

“1”

(bit 5 at address 1F16)

Pin VREF is disconnected from resistor

ladder network. (Note 1)

Port level is fixed.

(Note 2)

Stop mode is selected.

Bits 2 to 0 at addresses 7016 to 7E16

“

0002”

Key input (INT2) interrupt routine

Key data is read-in.

RTI

Port P5 register’s bits which correspond to pins P50 to P53

“0”

(bits 0 to 3 at address B16)

Scan output: “L” level

Port P5 register’s bits which correspond to pins P50 to P53

“0”

(bits 0 to 3 at address B16)

Scan output: “L” level

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