參數(shù)資料
型號: HCD40C4344R
廠商: Hitachi,Ltd.
英文描述: 4-bit HMCS400-series microcomputer(4位單片微計算機(jī))
中文描述: 4位HMCS400系列微電腦(4位單片微計算機(jī))
文件頁數(shù): 80/100頁
文件大?。?/td> 610K
代理商: HCD40C4344R
HD404344R Series/HD404394 Series
80
Programmable ROM Operation
The HD4074344 and HD4074394 on-chip PROMs are programmed in PROM mode.
In PROM mode, the MCU does not operate. It can be programmed like a standard 27256 EPROM using a
standard PROM programmer and a socket adapter as shown in figure 61. Table 23 lists the recommended
PROM programmers and socket adapters.
Since instructions of the HMCS400 series consists of 10 bits, the HMCS400 series microcomputers
incorporate a conversion circuit to enable the use of a general-purpose PROM programmer. By this circuit,
an instruction is read or written to using two addresses, lower five bits and upper five bits. For example, if
4 kwords of on-chip PROM are programmed by a general-purpose PROM programmer, 8 kbytes of
addresses ($0000–$1FFF) should be specified.
Control signals
Address bus
Data bus
A
14
, A
13
2
A
12
–A
0
O
4
–O
0
28-to-28-pin socket adapter
30-to-28 pin socket adapter
PROM programmer
V
V
PP
GND
A
14
–A
0
O
7
–O
0
O
7
–O
5
CE
,
OE
A
12
–A
0
O
4
–O
0
HD4074344
HD4074394
V
CC
GND
V
PP
X
ON
M
0
RESET
3
Figure 61 PROM Mode Connections
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