m38039mf-xxxsp Mitsumi Electronics, Corp., m38039mf-xxxsp Datasheet - Page 96

• Manufacturer Part Number: m38039mf-xxxsp
• Description: Single-chip 8-bit Cmos Microcomputer
• Manufacturer: Mitsumi Electronics, Corp.

The microcomputer enters the read mode by inputting command
code “00
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.
Fig. 89 Timings during reading
96
Read command
16
” in the first cycle. The command code is latched into
Address
CE
OE
WE
Data
V
PP
V
V
V
V
V
V
V
V
V
V
V
V
IH
IL
IH
IL
IH
IL
IH
IL
IH
IL
PP
PP
H
L
t
t
t
RRW
VSC
CS
___
t
00
WP
t
t
DS
WC
16
t
CH
t
DH
t
WRR
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
Valid address
t
a(AD)
t
t
CLZ
a(CE)
t
t
OLZ
RC
t
a(OE)
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Dout
t
MITSUBISHI MICROCOMPUTERS
DH
t
DF
16
.
3803/3804 Group