M37207MF datasheet(76/122 Pages) RENESAS

76 / 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

Power source voltage 0 V

Reset input voltage 0 V

4.5 V

0.6 V

Poweron

Vcc

RESET

Vss

Microcomputer

0.1

µF

M51953AL

RESET CIRCUIT

When the oscillation of a quartz-crystal oscillator or a ceramic reso-

nator is stable and the power source voltage is 5 V ± 10 %, hold the

______

RESET pin at LOW for 2 µs or more, then return is to HIGH. Then, as

shown in Figure 75, reset is released and the program starts from

the address formed by using the content of address FFFF16 as the

high-order address and the content of the address FFFE16 as the

low-order address. The internal state of microcomputer at reset are

shown in Figure 75.

An example of the reset circuit is shown in Figure 74.

The reset input voltage must be kept 0.6 V or less until the power

source voltage surpasses 4.5 V.

Fig. 74. Example of Reset Circuit

Fig. 75. Reset Sequence

XIN

RESET

Internal RESET

SYNC

Address

Data

32768 count of XIN

clock cycle (Note 3)

Reset address from the vector table

01, S

01, S-1 01, S-2

FFFE

FFFF

ADH,

ADL

ADH

Notes 1 :

f(XIN) and f(

φ) are in the relation : f(XIN) = 2·f (φ).

A question mark (?) indicates an undefined state that

depends on the previous state.

Immediately after a reset, timer 3 and timer 4 are

connected by hardware. At this time, “FF16” is set

in timer 3 and “0716” is set to timer 4. Timer 3 counts down

with f(XIN)/16, and reset state is released by the timer 4

overflow signal.

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