UPD78F9500MA-CAC-A Datasheet, PDF (240/342 Pages) Renesas Technology Corp – 8-Bit Single-Chip Microcontrollers

CHAPTER 16 FLASH MEMORY
This register is set with an 8-bit memory manipulation instruction.
Reset signal generation makes the contents of this register undefined.
Figure 16-10. Format of Flash Programming Mode Control Register (FLPMC)
Address: FFA2H
After reset: Undefined^{Note 1}
R/W^{Note 2}
Symbol
7
6
5
4
3
2
1
FLPMC
0
PRSELF4 PRSELF3 PRSELF2 PRSELF1 PRSELF0
0
0
FLSPM
FLSPM
0
1
Selection of operation mode during self-programming mode
Normal mode
This is the normal operation status. Executing the HALT instruction sets
standby status.
Self-programming mode
Self programming commands can be executed by executing the specific
sequence to change modes while in normal mode.
Set a command, an address, and data to be written, then execute the HALT
instruction to execute self programming.
PRSELF4 PRSELF3 PRSELF2 PRSELF1 PRSELF0 ^{The set value of the protect byte}
is read to these bits.
Notes 1. Bit 0 (FLSPM) is cleared to 0 when reset is released. The set value of the protect
byte is read to bits 2 to 6 (PRSELF0 to PRSELF4) after reset is released.
2. Bits 2 to 6 (PRSELF0 to PRSELF4) are read-only.
Cautions 1. Cautions in the case of setting the self programming mode, refer to 16.8.2
Cautions on self programming function.
2. Set the CPU clock so that it is 1 MHz or more during self programming.
3. Execute the NOP and HALT instructions immediately after executing a
specific sequence to set self-programming mode, then execute self
programming. At this time, the HALT instruction is automatically released
after 10 μs (MAX.) + 2 CPU clocks (fCPU).
4. If the clock of the oscillator or an external clock is selected as the system
clock, execute the NOP and HALT instructions immediately after executing a
specific sequence to set self-programming mode, wait for 8 µs after
releasing the HALT status, and then execute self programming.
5. Clear the value of the FLCMD register to 00H immediately before setting self-
programming mode and normal operation mode.
238
User’s Manual U18172EJ3V0UD