LC87F6AC8A

No.A0145-5/34

System clock divider function

• Capable of run

The minimum instruction cycle time can be selected from among 300ns, 600ns, 1.2

μs, 2.4μs, 4.8μs, 9.6μs, 19.2μs,

38.4

μs, and 76.8μs (at a main clock rate of 10MHz).ning on low current.

Clock output function

<1> Capable of generating 1/1, 1/2, 1/4, 1/8, 1/16, 1/32, or 1/64 of the source clock that is selected as the system

clock.

<2> Capable of generating the source clock for the subclock.

Standby function

• HALT mode: Halts instruction execution while allowing the peripheral circuits to continue operation. (The VFD

display function and part of the serial transfer functions are disabled.)

<1> Oscillation is not halted automatically.

<2> Released by system reset or occurrence of an interrupt.

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

<1> The CF oscillator, RC oscillator, crystal oscillator, and multifrequency RC oscillator automatically stop

operation.

<2> There are three ways of releasing HOLD mode:

1) Setting the reset pin to a low level

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

3) Establishing an interrupt source at port 0

• X’tal HOLD mode: Suspends instruction execution and the operation of the peripheral circuits except the base timer.

<1> The CF oscillator, RC oscillator, and multifrequency RC oscillator automatically stop operation.

<2> The crystal oscillator retains the state when X’tal HOLD mode is entered.

<3> There are four ways of releasing X’tal HOLD mode:

1) Setting the reset pin to a low level

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

3) Establishing an interrupt source at port 0

4) Establishing an interrupt source in the base timer circuit

On-chip debugger function

• Supports software debugging with the microcontroller mounted on the target device

Development tools

• Evaluation chip: LC87EV690

• Flash ROM programming board: W87FQ100

User Option Selection

Emulator

LC876A00 series compatible

EVA62S + ECB876600D + SUB876A00 + POD100QFP

ICE-B877300 + SUB876A00 + POD100QFP

LC876B00 series compatible

EVA62S + ECB876600D + SUB876B00 + POD100QFP

ICE-B877300 + SUB876B00 + POD100QFP

Same package and pin assignment as mask ROM version

• The LC87F6AC8A allows the user to specify the optional functions of the LC876A00 or LC876B00 series

microcontrollers in the form of flash ROM data (note, however, that pins S32 to S47 are not provided with an internal

pull-down resistor). This makes it possible to conduct sample tests using the production model circuit board.

• When a program that is designed for the mask ROM version is applied to the LC87F6AC8A, the size of ROM and

RAM that can be used is the same as that of the mask ROM version of the microcontrtoller.