參數(shù)資料
型號(hào): HCD404084
廠商: Hitachi,Ltd.
英文描述: Low-Voltage AS Microcomputers with On-Chip A/D Converter(帶片上A/D轉(zhuǎn)換器的低壓微計(jì)算機(jī))
中文描述: 低電壓如同在微機(jī)芯片的A / D轉(zhuǎn)換器(帶片上的A / D轉(zhuǎn)換器的低壓微計(jì)算機(jī))
文件頁數(shù): 113/162頁
文件大小: 482K
代理商: HCD404084
HD404374/HD404384/HD404389/HD404082/HD404084 Series
113
3. Two levels of program voltages (V
PP
) are available for the PROM: 12.5V and 21V. Our product
employs a V
PP
of 12.5V. If a voltage of 21V is applied, permanent breakdown of the product will
result. The V
PP
of 12.5V is obtained for the PROM writer by setting it according to the Intel 27258
specifications.
Table 27
Socket Adapters
Package
Model Name
Manufacturer
FP-30D
Please ask Hitachi service section.
DP-28S
Please ask Hitachi service section.
Writing/Verification
Programming of the built-in program ROM employs a high speed programming method. With this method,
high speed writing is effected without voltage stress to the device or without damaging the reliability of the
written data.
A basic programming flow chart is shown in figure 71 and a timing chart in figure 72.
For precautions for PROM writing procedure, refer to “Precautions for use of ZTAT
TM
microcomputer with
build-in programmable ROM”.
Table 28
Selection of Mode
Mode
CE
OE
V
PP
V
PP
V
PP
V
PP
O
0
to O
4
Data input
Writing
“Low”
“High”
Verification
“High”
“Low”
Data output
Prohibition of programming
“High”
“High”
High impedance
Table 29
PROM Writer Program Address
ROM size
Address
2k
$0000~$0FFF
4k
$0000~$1FFF
8k
$0000~$3FFF
16k
$0000~$7FFF
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