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參數(shù)資料
| 型號： | HD40L4818 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 4-Bit Single-Chip Microcomputer(4位單片微計算機) |
| 中文描述： | 4位單片機（4位單片微計算機） |
| 文件頁數(shù)： | 70/98頁 |
| 文件大?。?/td> | 621K |
| 代理商： | HD40L4818 |
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HD404818 Series
70
Programmable ROM Operation
The MCU on-chip PROM is programmed in PROM mode. PROM mode is set by pulling
TEST
,
M
0
, and
M
1
low, and RESET high, as shown in figure 38. In PROM mode, the MCU does not operate. It can be
programmed like a standard 27256 EPROM using a standard PROM programmer and an 80-to-28-pin
socket adapter. Table 31 lists the recommended PROM programmers and socket adapters.
Since an instruction of the HMCS400 series consists of 10 bits, the HMCS400 series microcomputer
incorporates a conversion circuit to enable the use of a general-purpose PROM programmer. By this circuit,
an instruction is read or programmed using two addresses, a lower 5 bits and upper 5 bits. For example, if 8
kwords of on-chip PROM are programmed by a general-purpose PROM pro-grammer, 16 kbytes of
addresses ($0000–$3FFF) should be specified.
Programming and Verification
The MCU can be programmed at high speed without causing voltage stress or affecting data reliability.
Table 30 shows how programming and verification modes are selected.
Precautions
1. Addresses $0000 to $3FFF must be specified if the PROM is programmed by a PROM programmer. If
addresses of $4000 or higher are accessed, the PROM may not be programmed or verified. Note that
plastic package types cannot be erased and reprogrammed. Data in unused addresses must be set to $FF.
2. Ensure that the PROM programmer, socket adapter, and LSI match. Using the wrong programmer for
the socket adapter may cause an overvoltage and damage the LSI. Make sure that the LSI is firmly fixed
in the socket adapter, and that the socket adapter is firmly fixed onto the programmer.
3. The PROM should be programmed with V
PP
= 12.5 V. Other PROMs use 21 V. If 21 V is applied to the
MCU, the LSI may be permanently damaged. 12.5 V is the Intel 27256 setting.
Table 30 PROM Mode Selection
Pin
CE
Mode
OE
V
PP
V
PP
V
PP
V
PP
O
0
–O
7
Data input
Programming
Low
High
Verify
High
Low
Data output
Programming inhibited
High
High
High impedance
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD40L4818H | 制造商:Renesas Electronics Corporation 功能描述: |
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| HD40WS/EHOOD/PLUG | 制造商:Lapp 功能描述:HD 40 way side entry assembled plug 制造商:Lapp Group 功能描述:HD 40 way side entry assembled plug |
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| HD4-15530/883 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Encoder/Decoder |
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