38C3 datasheet(132/224 Pages) RENESAS

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38C3 Group User’s Manual

APPLICATION

2-67

2.6 ROM correct function

2.6.3 ROM correct function application examples

Outline: When the contents of ROM would be corrected, the contents of ROM can be changed artificially

by connecting E2PROM to the externals and storing the contents (correct address, correct data)

to the ROM correct function relevant registers.

Fig. 2.6.3 Connection diagram

Specifications: qIf ROM correct is necessary, make P51 pull-up. If ROM correct is unnecessary, make P51

pull-down.

qUse of serial I/O as communication with E2PROM

qConnection of clock and SCLK1, connection of CS pin and P47

Fig. 2.6.4 Setting of relevant registers

P46

P44

P47

P51

38C3 group

SCLK1

SIN

P47

CLK

DATA

38C3 group

E2PROM

qWhen ROM correct is unnecessary

qWhen ROM correct is necessary

P51

CLK

OUT

Serial I/O control register 2 (address 001A16)

SCLK1

SIOCON2

Serial I/O control register 1 (address 001916)

SOUT, SCLK1, SCLK2

signal pins

SIOCON1

I/O port

Internal clock

Port P4 (address 000816)

Set CS signal

to E2PROM

Port P4 direction register (address 000916)

P4D

Set P44, P46, P47 to output ports.

Port P4 (address 000816)

Set “L” output as

termination of

unused pins

When ROM correct is unnecessary

When ROM correct is necessary

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