HD64F3437TF16 Datasheet, PDF (558/752 Pages) Hitachi Semiconductor – 12 V must not be applied to the S-mask model (single-power-supply specification), as this may permanently damage the device.

Figure 21.15 shows the memory map in writer mode, and table 21.10 shows writer mode pin
settings. For pin names in writer mode, see section 1.3.2, Pin Functions in Each Operating Mode.
MCU mode
H'0000
H8/3437SF
Writer mode
H'0000
On-chip ROM area
H'F77F
H'F77F
Undetermined values
output
H'1FFFF
Figure 21.15 Memory Map in Writer Mode
21.5.3 Operation in Writer Mode
Table 21.11 shows how to select the various operating modes when using writer mode, and table
21.12 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 FO6 signal. In status read mode, error information is output if an
error occurs.
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