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19.1.3 Read–only mode
When connecting shown in Figure 19.1.3 and V
operates at the read–only mode. In the read–only mode, the built–in flash memory becomes read, output
disable, or standby state depending on the control signals. In this mode, the contents of the built–in flash
memory can be read. Table 19.1.3 lists the states of the built–in flash memory.
Table 19.1.3 States of control signals and built–in flash memory in read–only mode
Pin
State
Read
Output disable
Standby
Note:
can be V
or V
IL
(1) Read
When inputting the address of a memory location to be read and the control signals at the timing
shown in Figure 19.1.4, data of the specified address (input address) is output to an external.
A
A
0–
16
CE
OE
WE
Floating
D
D
0–
7
Fig. 19.1.4 Read timing
___
___
CE
OE
V
V
IL
IL
V
V
IL
IH
V
IH
.
IH
t
WRR
7751 Group User's Manual
FLASH MEMORY VERSION
19.1 Parallel input/output mode
L level is applied to the V
PP
___
WE
V
IH
V
IH
Read address
t
RC
t
a
(CE)
t
a
(OE)
t
OLZ
t
CLZ
t
a
(AD)
pin, the built–in flash memory
PP
V
Data I/O
PP
V
L
Output
PP
V
L
Floating
PP
V
L
Floating
PP
t
DF
t
OH
Floating
Data
Read data output
19–7
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