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15.8.3
PROM Mode Operation
Table 15-10 shows how the different operating modes are set when using PROM mode, and table
15-11 lists the commands used in PROM mode. Details of each mode are given below.
• Memory Read Mode
Memory read mode supports byte reads.
• Auto-Program Mode
Auto-program mode supports programming of 128 bytes at a time. Status polling is used to
confirm the end of auto-programming.
• Auto-Erase Mode
Auto-erase mode supports automatic erasing of the entire flash memory. Status polling is used
to confirm the end of auto-erasing.
• Status Read Mode
Status polling is used for auto-programming and auto-erasing, and normal termination can be
confirmed by reading the I/O 6 signal. In status read mode, error information is output if an
error occurs.
Table 15-10 Settings for Each Operating Mode in PROM Mode
Mode
FWE
Read
V
Output disable
V
Command write
V
1
Chip disable*
V
L
: Low level
H
: High level
X
: Undefined
Hi-z
: High impedance
Notes: For command writes when making a transition to auto-program or auto-erase mode, input
Vcc (V) to FWE.
1. Chip disable is not a standby state; internally, it is an operation state.
2. Ain indicates that there is also address input in auto-program mode.
3. The pin names are those assigned in this LSI PROM mode.
472
CE
or 0
L
CC
or 0
L
CC
or 0
L
CC
or 0
H
CC
Pin Names*
OE
WE
L
H
H
H
H
L
X
X
3
D
to D
A
0
7
Data output
Ain
Hi-z
X
Data input
Ain*
Hi-z
X
to A
0
17
2
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