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HD404328 Datasheet, PDF (71/96 Pages) Hitachi Semiconductor – 4 BIT SINGLE CHIP MICROCOMPUTER
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HD404328 Series
PROM Mode Description
Programming the Built-In ROM
The MCU’s built-in ROM is programmed in PROM mode in which the pins are arranged as shown in
figure 42. PROM mode is set by pulling TEST, M0, and M1 low, and RESET high as shown in figure 43.
In PROM mode, the MCU does not operate, but it can be programmed in the same way as any other
commercial 27256-type EPROM using a standard PROM programmer and a 64-to-28–pin socket adapter.
Recommended PROM programmers and socket adapters are listed in table 35.
Since an HMCS400-series instruction is ten bits long, the HMCS400-series MCU has a built-in conversion
circuit to enable use of a general-purpose PROM programmer. This circuit splits each instruction into a
lower five bits and an upper five bits that are read from or written to consecutive addresses. This means
that if, for example, 16 kwords of built-in PROM are to be programmed by a general-purpose PROM
programmer, a 32-kbyte address space ($0000–$7FFF) must be specified.
VCC
M0
M1
VCC
VCC
GND
TEST
VCC
RESET
GND
GND
A7
A8
A0
A 10
A 11
A 12
A 13
A 14
A9
VPP
A5
A6
O4
O3
O2
1
64
2
63
3
62
4
61
5
60
6
59
7
58
8
57
9
56
10
55
11
54
12
53
13
52
14
51
15
50
16 HD4074329S 49
17 HD4074329US 48
18 HD4074329C 47
19
46
20
45
21
44
22
43
23
42
24
41
25
40
26
39
27
38
28
37
29
36
30
35
31
34
32
33
VCC
M0 M1VCC
VCC
VCC
VCC
GND
64 63 62 61 60 59 58 57 56 55 54 53 52
1
51
2
50
3
49
TEST 4
48
VCC
5
47
6
46
RESET 7
45
GND 8
44
9
43 OE
OE
GND 10
A7 11
HD4074329FS
HD4074329UFS
42 CE
41 A4
CE
A8 12
40 A3
A4
A3
A2
A1
O7
O6
O5
A0 13
39 A2
A10 14
38 A1
A11 15
37 O 7
A12 16
36 O 6
A13 17
35 O 5
A14 18
34 O 4
19
33 O 3
20 21 22 23 24 25 26 27 28 29 30 31 32
O4
O3
O2
A9VPPA5 A6 O 4O 3O 2O 1O 0VCCO0O 1 O 2
O1
O0 Note: Externally connect pins of the same name. This is not
VCC
necessary if one of the sockets listed in table 35 is used.
O0
O1
Figure 42 Pin Arrangement in PROM Mode
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