參數(shù)資料
型號(hào)： M34501E4FP
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
中文描述： 單芯片4位微機(jī)的CMOS
文件頁(yè)數(shù)： 108/113頁(yè)
文件大?。?/td> 1252K
代理商： M34501E4FP
108
4501 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
Table 20 Product of built-in PROM version
PROM size
(
10 bits)
4096 words
RAM size
(
4 bits)
256 words
M34501E4FP
One Time PROM [shipped in blank]
20P2N-A
BUILT-IN PROM VERSION
In addition to the mask ROM versions, the 4501 Group has the
One Time PROM versions whose PROMs can only be written to
and not be erased.
The built-in PROM version has functions similar to those of the
mask ROM versions, but it has PROM mode that enables writing to
built-in PROM.
Table 20 shows the product of built-in PROM version. Figure 52
shows the pin configurations of built-in PROM versions.
The One Time PROM version has pin-compatibility with the mask
ROM version.
(1) PROM mode
The 4501 Group has a PROM mode in addition to a normal opera-
tion mode. It has a function to serially input/output the command
codes, addresses, and data required for operation (e.g., read and
program) on the built-in PROM using only a few pins. This mode
can be selected by setting pins SDA (serial data input/output),
S
CLK
(serial clock input), PGM to
“
H
”
after connecting wires as
shown in Figure 54 and powering on the V
DD
pin, and then apply-
ing 12 V to the V
PP
pin.
In the PROM mode, three types of software commands (read, pro-
gram, and program verify) can be used. Clock-synchronous serial
I/O is used, beginning from the LSB (LSB first).
Use the special-perpose serial programmer when performing serial
read/program.
As for the serial programmer for the Mitsubishi single-chip micro-
computer (serial programmer and control software), refer to the
“
Mitsubishi Microcomputer Development Support Tools
”
Hompage
(http://www.tool-spt.mesc.co.jp/index_e.htm).
Fig. 53 Flow of writing and test of the product shipped in blank
ROM type
Package
Product
W
r
i
t
i
n
g
w
i
t
h
P
R
O
M
p
r
o
g
r
a
m
m
e
r
Screening (Leave at 150
°
C for 40 hours) (
Note
)
Verify test with PROM programmer
Function test in target device
S
t
h
m
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a
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u
Note:
(2) Notes on handling
A high-voltage is used for writing. Take care that overvoltage is
not applied. Take care especially at turning on the power.
For the One Time PROM version shipped in blank, Mitsubishi
Electric corp. does not perform PROM writing test and screening
in the assembly process and following processes. In order to im-
prove reliability after writing, performing writing and test
according to the flow shown in Figure 53 before using is recom-
mended (Products shipped in blank: PROM contents is not
written in factory when shipped).
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