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6.8.3
Writer Mode Operation
Table 6.10 shows how the different operating modes are set when using Writer mode, and table
6.11 lists the commands used in Writer 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 FO
output if an error occurs.
Table 6.10 Settings for Operating Modes In Writer Mode
Mode
Read
Output disable
Command write
1
Chip disable*
Legend:
L:
Low level
H:
High level
X:
Undefined
Hi-Z: High impedance
Notes: 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. For command writes in auto-program and auto-erase modes, input a high level to the
FWE pin.
4. Pin names are those assigned in Writer mode. See figure 6.16 (a) for the H8/3857F,
and figure 6.16 (b) for the H8/3854F.
signal. In status read mode, error information is
7
CE
OE
FWE
H/L
L
L
H/L
L
H
3
H/L*
L
H
H/L
H
X
4
Pin Names*
WE
FO0 to FO7
H
Data output
H
Hi-Z
L
Data input
X
Hi-Z
Rev.3.00 Jul. 19, 2007 page 153 of 532
6. ROM
FA0 to FA15
Ain
X
2
Ain*
X
REJ09B0397-0300
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