M37544 RENESAS [Renesas Technology Corp], M37544 Datasheet - Page 45

• Manufacturer Part Number: M37544
• Description: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
• Manufacturer: RENESAS [Renesas Technology Corp]

Rev.1.04
REJ03B0012-0104Z
7544 Group
Fig. 60 “Mad Dog Entry” Pin Diagram (32P4B)
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 (V
try operation, called “Mad Dog Entry”.
RESETB
ESCLK
XOUT
VCC
VPP
VSS
2004.06.08
XIN
page 45 of 66
CC
). Then execute the new OTP en-
P1
P1
P1
4
P2
P2
P2
P2
P2
P2
/CNTR
RESET
CNV
3
2
0
1
2
3
4
5
/S
/S
X
/AN
/AN
/AN
/AN
/AN
/AN
V
V
V
OUT
RDY
REF
CLK
X
CC
SS
SS
IN
0
0
1
2
3
4
5
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
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.
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
P0
P0
P0
P0
P0
P0
P3
P3
P3
P3
P1
P1
P0
P0
P3
P3
1
0
7
6
5
4
3
2
1
0
7
4
3
2
1
0
/T
/R
(LED
(LED
(LED
(LED
(LED
(LED
(LED
(LED
(LED
(LED
(LED
(LED
(LED
(LED
X
X
D
D
7
6
5
4
3
2
1
13
11
10
9
8
0
12
)
)
)
)
)/TX
)
)
)/CNTR
)
)
)/INT
)/INT
)
)
OUT
0
1
1
ESPGMB
ESDA