M37544 Datasheet, PDF (45/68 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

7544 Group
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.
ESCLK
RESETB
VPP
VCC
XIN
XOUT
VSS
P12/SCLK
1
P13/SRDY
2
P14/CNTR0
3
P20/AN0
4
P21/AN1
5
P22/AN2
6
P23/AN3
7
P24/AN4
8
P25/AN5
9
VREF
10
RESET
11
CNVSS
12
VCC
13
XIN
14
XOUT
15
VSS
16
32
P11/TXD
31
P10/RXD
ESDA
ESPGMB
30
P07(LED7)
29
P06(LED6)
28
P05(LED5)
27
P04(LED4)
26
P03(LED3)/TXOUT
25
P02(LED2)
24
P01(LED1)
23
P00(LED0)/CNTR1
22
P37(LED13)/INT0
21
P34(LED12)/INT1
20
P33(LED11)
19
P32(LED10)
18
P31(LED9)
17
P30(LED8)
Fig. 60 “Mad Dog Entry” Pin Diagram (32P4B)
Rev.1.04 2004.06.08 page 45 of 66
REJ03B0012-0104Z