Symbol description

AC

: Accumulator

D

: Immediate Date

ACn

: Accumulator Bit N

PC

: Program Counter

X

: Address

CF

: Carry Flag

Rx

: Memory of Address X

ZERO

: Zero Flag

Rxn

: Memory Bit N of Address X

WDF

: Watchdog Timer Enable Flag

Ry

: Memory of Working Register Y

HL

: Index Register

BCF

: Backup Flag

BCLK

: System clock stops only in STOP condition

@HL

: Addres s of Index

IEFn

: Interrupt Enable Flag

HRFn

: HALT Release Flag

SRFn

: STOP Release Enable Flag

HEFn

: HALT Release Enable Flag

SCFn

: Start Condition Flag

Cfq

: Clock Source of Frequency Generator

Cch

: Clock Source of Chattering Detector

Ctm

: Clock Source of Timer

TMR

: Timer Overflow Release Flag

Fout

: RFC Frequency

( )

: Content of Register

PDV

: Predivider

SEFn

: Switch Enable Flag

Lz

: LCD Latch

FREQ

: Frequency Generator Setting Value

T@HL

: Address of Index ROM

ADF

: ADC Flag

CSF

: Clock Source Flag

DAC

: Digital-to-Analog Converter Output Signal

@L

: Low Address of Index

@H

: High Address of Index

RFOVF

: RFC Overflow Flag

H(T@HL) : High Nibble of Index ROM

L(T@HL) : Low Nibble of Index ROM

Appendix (Important Issue for

APU429/428)

Chip’s internal vlotage V.S. power mode and external connection

AG

LI

EXT-V

Note

Vsupply

1/2 × Vsupply

1/2 × Vsupply

Vsupply

Vsupply

3/2 × Vsupply

3/2 × Vsupply

*1

2 × Vsupply

2 × Vsupply

*2

BCF=0

BCF=1

BAK

*3

*3: BAK is defined as chip’s internal power supply node, which is used only for internal logic circuitry.

A. Whatever the power mode used, all external VDD# pins must connect a capacitor (0.05 F or 0.1 F) to

GND for decoupling power noise using.

B. All VDD# pins other than Vsupply are from voltage charge pump, i.e. If no clock, then VDD# pins can

not supply out.

C. Vsupply is the power supply for Chip and depends on the power mode used, all the input and output

pins voltage range follow the Vsupply.

The capacitor connected between CUP2 and CUP3 is only when

APU429 operating in 1/4 bias.

Some notes for BCF flag

BCF is always set to High automatically after Power on, Reset and STOP mode.

A. For power saving use, BCF may be set to Low which can reduce chip’s current consumption.

Preliminary

17

Ver. 0.0