LC87F1A32A

No.A0704-4/26

Interrupts

 28 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/USB bus active/Remote control receive

4

0001BH

H or L

INT3/INT5/base timer

5

00023H

H or L

T0H

6

0002BH

H or L

T1L/T1H

7

00033H

H or L

SIO0/USB bus reset/USB suspend/UART1 receive

8

0003BH

H or L

SIO1/USB endpoint/USB-SOF/SIO4/UART1 transmit

9

00043H

H or L

ADC/T6/T7

10

0004BH

H or L

Port 0/PWM0/PWM1

 Priority Level: X > H > L

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

Subroutine Stack Levels: 1024 levels (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

 RC oscillation circuit (internal):

For system clock

 CF oscillation circuit:

For system clock

 Crystal oscillation circuit:

For system clock, time-of-day clock

 PLL circuit (internal):

For USB interface (see Fig.5)

Standby Function

 HALT mode: Halts instruction execution while allowing the peripheral circuits to continue operation.

1) Oscillation is not halted automatically.

2) Canceled by a system reset or occurrence of an interrupt.

 HOLD mode: Suspends instruction execution and the operation of the peripheral circuits.

1) The PLL base clock generator , CF, RC and crystal oscillators automatically stop operation.

2) There are four ways of resetting the HOLD mode.

(1) Setting the reset pin to the lower level.

(2) Setting at least one of the INT0, INT1, INT2, INT4, and INT5 pins to the specified level

(3) Having an interrupt source established at port 0

(4) Having an bus active interrupt source established in the USB interface circuit

 X'tal HOLD mode: Suspends instruction execution and the operation of the peripheral circuits except for reception

of a remote control signal.

1) The PLL base clock generator, CF and RC oscillator automatically stop operation.

2) The state of crystal oscillation established when the X'tal HOLD mode is entered is retained.

3) There are six ways of resetting the X'tal HOLD mode.

(1) Setting the reset pin to the low level

(2) Setting at least one of the INT0, INT1, INT2, INT4, and INT5 pins to the specified level

(3) Having an interrupt source established at port 0

(4) Having an interrupt source established in the base timer circuit

(5) Having an bus active interrupt source established in the USB interface circuit

(6) Having an interrupt source established in the infrared remote controller receiver circuit.