M37544G2SP datasheet(45/68 Pages) RENESAS

45 / 68 page

7544 Group

Rev.1.04

2004.06.08

page 45 of 66

REJ03B0012-0104Z

PROM Mode

M37544G2SP/GP (referred to as “the MCU”) has a PROM Mode

as well as the normal operation mode. PROM Mode enables an

external device (referred to as “Programmer”) to read and pro-

gram the built-in EPROM via a minimum number of serial I/O pins

by sending commands to control the MCU.

To enable PROM Mode, use the pin connection shown in Figure

60 to 61 and apply power (VCC). Then execute the new OTP en-

try operation, called “Mad Dog Entry”.

There are three operation modes in PROM Mode : Read, Program

and Program-Verify. Three commands are defined to enable each

mode respectively.

The format of the serial I/O is : clock synchronous and LSB-data-

first.

P12/SCLK

P13/SRDY

P14/CNTR0

P20/AN0

P21/AN1

P22/AN2

P23/AN3

P24/AN4

P25/AN5

VREF

CNVSS

VCC

XIN

XOUT

VSS

RESET

P11/TXD

P10/RXD

P07(LED7)

P06(LED6)

P05(LED5)

P04(LED4)

P03(LED3)/TXOUT

P02(LED2)

P01(LED1)

P00(LED0)/CNTR1

P34(LED12)/INT1

P33(LED11)

P32(LED10)

P31(LED9)

P30(LED8)

P37(LED13)/INT0

ESCLK

RESETB

VPP

VCC

XIN

XOUT

VSS

ESDA

ESPGMB

Fig. 60 “Mad Dog Entry” Pin Diagram (32P4B)

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