LC87F2G08A

No.A1028-3/27

Remote Control Receiver Circuit (sharing pins with P15, SCK1, INT3, and T0IN)

• Noise rejection function (noise filter time constant selectable from 1 tCYC, 32 tCYC, and 128 tCYC)

Clock Output Function

• Can generate clock outputs with a frequency of 1/1, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64 of the source clock selected as

the system clock.

• Can generate the source clock for the subclock

Watchdog Timer

• External RC watchdog timer

• Interrupt and reset signals selectable

Interrupts

• 18 sources, 10 vector addresses

1) Provides three levels (low (L), high (H), and highest (X)) of multiplex interrupt control. Any interrupt requests of

the level equal to or lower than the current interrupt are not accepted.

2) When interrupt requests to two or more vector addresses occur at the same time, the interrupt of the highest level

takes precedence over the other interrupts. For interrupts of the same level, the interrupt into the smallest vector

address takes precedence.

No.

Vector Address

Level

Interrupt Source

1

00003H

X or L

INT0

2

0000BH

X or L

INT1

3

00013H

H or L

INT2/T0L/INT4

4

0001BH

H or L

INT3/base timer

5

00023H

H or L

T0H

6

0002BH

H or L

T1L/T1H

7

00033H

H or L

SIO0/UART1 receive

8

0003BH

H or L

SIO1/UART1 transmit

9

00043H

H or L

ADC/T6/T7

10

0004BH

H or L

Port 0

• Priority levels X > H > L

• Of interrupts of the same level, the one with the smallest vector address takes precedence.

Subroutine Stack Levels: 128levels (The stack is allocated in RAM.)

High-speed Multiplication/Division Instructions

• 16 bits × 8 bits

(5 tCYC execution time)

• 24 bits × 16 bits

(12 tCYC execution time)

• 16 bits ÷ 8 bits

(8 tCYC execution time)

• 24 bits ÷ 16 bits

(12 tCYC execution time)

Oscillation Circuits

• Internal oscillation circuits

Low-speed RC oscillation circuit :

For system clock (100kHz)

Medium-speed RC oscillation circuit :

For system clock (1MHz)

Multifrequency RC oscillation circuit :

For system clock (8MHz)

• External oscillation circuits

Hi-speed CF oscillation circuit:

For system clock, with internal Rf

Low speed crystal oscillation circuit:

For low-speed system clock, with internal Rf

1) The CF and crystal oscillation circuits share the same pins. The active circuit is selected under program control.

2) Both the CF and crystal oscillator circuits stop operation on a system reset. When the reset is released, only the

CF oscillation circuit resumes operation.