M37207MF datasheet(80/122 Pages) RENESAS

80 / 122 page

MITSUBISHI MICROCOMPUTERS

M37207MF-XXXSP/FP, M37207M8-XXXSP

M37207EFSP/FP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER

and ON-SCREEN DISPLAY CONTROLLER

ADDRESSING MODE

The memory access is reinforced with 17 kinds of addressing modes.

Refer to SERIES 740 <Software> User’s Manual for details.

MACHINE INSTRUCTIONS

There are 71 machine instructions. Refer to SERIES 740 <Soft- ware>

User’s Manual for details.

PROGRAMMING NOTES

(1) The divide ratio of the timer is 1/(n+1).

(2) Even though the BBC and BBS instructions are executed imme-

diately after the interrupt request bits are modified (by the pro-

gram), those instructions are only valid for the contents before

the modification. At least one instruction cycle is needed (such as

an NOP) between the modification of the interrupt request bits

and the execution of the BBC and BBS instructions.

(3) After the ADC and SBC instructions are executed (in the decimal

mode), one instruction cycle (such as an NOP) is needed before

the SEC, CLC, or CLD instruction is executed.

(4) An NOP instruction is needed immediately after the execution of

a PLP instruction.

(5) In order to avoid noise and latch-up, connect a bypass capacitor

(

≈ 0.1 µF) directly between the VCC pin–VSS pin and the VCC pin–

CNVSS pin, using a thick wire.

AUTO-CLEAR CIRCUIT

When a power source is supplied, the auto-clear function will oper-

______

ate by connecting the following circuit to the RESET pin.

Fig. 81. Auto-clear Circuit Example

Fig. 80. Display Oscillation Circuit

DISPLAY OSCILLATION CIRCUIT

The CRT display clock oscillation circuit has a built-in clock oscilla-

tion circuits, so that a clock for CRT display can be obtained simply

by connecting an LC, an RC, a quartz-crystal oscillator or a ceramic

resonator across the pins OSC1 and OSC2. Which of the sub-clock

or the display oscillation circuit is selected by setting bits 0 and 1 of

the CRT clock selection register (address 020916).

OSC2

OSC1

RESET

Vss

Vcc

Circuit example 1

RESET

Vss

Vcc

Circuit example 2

Note : Make the level change from LOW to HIGH at the point at

which the power source voltage exceeds the specified

voltage.

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