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• Since the stack area is used in the initialization program, 128-byte stack area at the maximum
must be saved in RAM.
• Interrupts can be accepted during the execution of the initialization program. The program
storage area and stack area in the on-chip RAM and register values must not be destroyed.
8. Check the return value in the initialization program, FPFR (general register R0L)
9. Disable all interrupts and the use of a bus master other than the CPU
The specified voltage is applied for the specified time when programming or erasing. If
interrupts occur or the bus mastership is moved to other than the CPU during this time and the
voltage is applied for more than the specified time, flash memory may be damaged. Therefore,
interrupts and bus mastership moved to other than the CPU must be disabled.
When interrupts are disabled, bit 7 (I) in the condition code register (CCR) of the CPU should
be set to B'1 in interrupt control mode 0 or bits 7 and 6 (I and UI) in CCR should be set to B'11
in interrupt control mode 2. Then interrupts other than the NMI are retained and are not
executed.
The NMI interrupt must be masked within the user system.
The interrupts that are retained must be executed after all program processing.
10. Set FKEY to H'5A to enable the user MAT programming.
11. Set the parameter which is required for programming
The start address of the programming destination of the user MAT (FMPAR) is set to the
general register ER1. The start address of the program data area (FMPDR) is set to the general
register ER0.
• Example of the FMPAR setting
FMPAR specifies the programming destination address. When an address other than one in the
user MAT area is specified, even if the programming program is executed, programming is not
executed and an error is returned to the return value parameter FPFR. Since the unit is 128
bytes, the lower eight bits of the address must be H'00 or H'80 as the boundary of 128 bytes.
• Example of the FMPDR setting
When the storage destination of program data is flash memory, even if the program execution
routine is executed, programming is not executed and an error is returned to FPFR. In this
case, the program data must be transferred to the on-chip RAM and then programming must be
executed.
12. Execute programming
There is an entry point of the programming program in the area from the start address specified
by FTDAR + 16 bytes of the on-chip RAM. The subroutine should be called and programming
should be executed by using the following steps.
Rev. 1.00, 09/03, page 560 of 704
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