M37160MF datasheet(91/131 Pages) RENESAS

91 / 131 page

Rev.1.01

2003.11.13

page 91 of 130

M37160M8/MA/MF-XXXSP/FP,M37160EFSP/FP

RESET

Vss

Vcc

Circuit example 1

RESET

Vss

Vcc

Circuit example 2

Note : Make the level change from “L” to “H” at the point at

which the power source voltage exceeds the specified

voltage.

8.15 ADDRESSING MODE

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

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

8.16 MACHINE INSTRUCTIONS

There are 71 machine instructions. Refer to SERIES 740 <Software>

User’s Manual for details.

9. TECHNICAL NOTES

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

•

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.

•

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.

•

An NOP instruction is needed immediately after the execution of

a PLP instruction.

•

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

(

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

CNVSS pin, using a thick wire.

•

Characteristic value, margin of operation, etc. of versions with

built-in EPROM and built-in mask ROM may differ from each other

within the limits of the electrical characteristics in terms of manu-

facturing process, built-in ROM, difference of a layout pattern,

etc.

Carry out and check an examination equivalent to the system

evaluation examination carried out on the EPROM version when

replacing it with the Mask ROM version.

8.14 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.8.14.1 Auto-clear Circuit Example

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