7470 Datasheet, PDF (36/47 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS
7470/7471 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
EPROM MODE
The M37470E4/E8, M37471E4/E8 feature an EPROM mode in ad-
dition to its normal modes. When the RESET signal level is low
(“L”), the chip automatically enters the EPROM mode. Table 2 lists
the correspondence between pins and Figure 30 to 32 give the pin
connection in the EPROM mode. When in the EPROM mode,
ports P0, P11–P17, P20–P23, P3, P40, P41, VREF are used for the
PROM (equivalent to the M5L27256). When in this mode, the built-
in PROM can be written to or read from using these pins in the
same way as with the M5L27256. The oscillator should be con-
nected to the XIN and XOUT pins, or external clock should be
connected to the XIN pin.
Table 2. Pin function in EPROM mode
M37470E4/E8, M37471E4/E8
VCC
VPP
VCC
P33
VSS
Address input
Data I/O
VSS
Ports P11–P17, P20–P23,
P30, P31, P40, P41
Port P0
CE
VREF
OE
P32
M5L27256
VCC
VPP
VSS
A0–A14
D0–D7
CE
OE
P53
1
A10
P17/SRDY
2
A9
P16/CLK
3
A8
P15/SOUT
4
A7
P14/SIN
5
A6
P13/ T1
6
A5
P12/ T0
7
A4
P11
8
P10
9
P27/IN7
10
P26/IN6
11
P25/IN5
12
P24/IN4
13
A3
P23/IN3
14
A2
P22/IN2
15
A1
P21/IN1
16
A0
P20/IN0
17
CE
VREF
18
XIN
19
XOUT
20
VSS
VSS
21
: Same functions as M5L27256
Fig. 28 Pin connection in EPROM mode
42
P52
41
P07
40
P06
39
P05
38
P04
37
P03
36
P02
35
P01
34
P00
33
P43
32
P42
31
P41
30
P40
29
P33/CNTR1
28
P32/CNTR0
27
P31/INT1
26
P30/INT0
25
RESET
24
P51/XCOUT
23
P50/XCIN
22
VCC
D7
D6
D5
D4
D3
D2
D1
D0
A14
A13
VPP
OE
A12
A11
VCC
VSS
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