Predivider

The predivider is a 15-sage counter that uses PH0 as clock source. The output of T-FF is changed when the

input signal is changed from H to L. PH11~15 are reset to L when PLC 100H instruction is executed,

power-on reset or external reset is used. When PH14 is changed from H to L, the HALT release signal is

generated.

Alarm/frequency/melody

There is an 8-bit programmable counter and an 8-bit envelope control for alarm, frequency or melody output

from BZ/BZB.

The frequency counter can use software to select 1/2 duty, 1/3 duty,1/4 duty drive modes.

Frequency

1/2 Duty Frequency

1/3 Duty Frequency

1/4 Duty Frequency

INT function

The INT pin can be selected by mask option as pull-high/pull-low or none, and as a rising edge/falling edge

trigger.

Watchdog Timer

The watchdog timer automatically generates a device reset when it overflows. The interval of overflow is

8/64/512 x PH10 (set by mask option). You can use software to enable and disable this function. The

watchdog enable flag will be disabled by power on reset or reset pin reset condition, but cannot be disabled

by watchdog reset itself.

HALT function

The HALT instruction disables all clocks except the predivider, timer, frequency counter, PWM, EL-light

generator and chattering clock in order to minimize the operating current.

STOP function

The STOP instruction disables all clocks to minimize the standby current, so only two external factors (INT,

IOA/IOC) can release the stop condition.

Instruction Table

Instruction

Machine Code

Function

Flag/Remark

NOP

0000 0000 0000 0000

No Operation

LCT Lz, Ry

0000 001Z ZZZZ YYYY

Lz

{ 7SEG

Ry}

LCB Lz, Ry

0000 010Z ZZZZ YYYY

Lz

{ 7SEG

Ry}

LCP Lz, Ry

0000 011Z ZZZZ YYYY

Lz

Ry , AC

LCD Lz, @HL

0000 100Z ZZZZ 0000

Lz

T@HL

OPA Rx

0000 1010 0XXX XXXX

Port(A)

Rx

OPAS Rx, D

0000 1011 DXXX XXXX

A1, 2, 3, 4

Rx0, Rx1, D, Pulse

OPB Rx

0000 1100 0XXX XXXX

Port(B)

Rx

Preliminary

12

Ver. 0.0

APU428