參數資料
型號: M38049FFHP
廠商: Mitsubishi Electric Corporation
英文描述: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述: 單芯片8位CMOS微機
文件頁數: 96/135頁
文件大?。?/td> 2055K
代理商: M38049FFHP
96
3803/3804 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
G
Read command
The microcomputer enters the read mode by inputting command
code
00
16
in the first cycle. The command code is latched into
the internal command latch at the rising edge of the WE input.
When the address of a memory location to be read is input in the
second cycle, with control signals input at the timing shown in Fig-
ure 89, the 3803/3804 group outputs the contents of the specified
address from the data I/O pins to the external.
The read mode is retained until any other command is latched into
the command latch. Consequently, once the 3803/3804 group en-
ters the read mode, the user can read out the successive memory
contents simply by changing the input address and executing the
second cycle only. Any command other than the read command
must be input beginning from its command code over again each
time the user execute it. The contents of the command latch immedi-
ately after power-on is 00
16
.
Fig. 89 Timings during reading
Address
Valid address
t
WC
t
CH
t
CS
t
RC
t
a(CE)
t
DF
t
WRR
t
WP
t
RRW
t
a(OE)
t
DH
t
DH
t
VSC
t
CLZ
t
OLZ
t
DS
t
a(AD)
V
IH
V
IL
V
IH
V
IL
V
IH
V
IL
V
IH
V
IL
V
IH
V
IL
V
PP
H
V
PP
L
CE
OE
WE
Data
V
PP
Dout
00
16
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