HD6432670 Hitachi, HD6432670 Datasheet - Page 815

• Manufacturer Part Number: HD6432670
• Description: (HD64F267x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

8. Do not use interrupts while flash memory is being programmed or erased.
9. Do not perform additional programming. Erase the memory before reprogramming.
10. Before programming, check that the chip is correctly mounted in the PROM programmer.
11. Do not touch the socket adapter or chip during programming.
12. Apply the reset signal after the SWE, bit is cleared during its operation.
When the SWE bit is set, data in flash memory can be rewritten. When the SWE bit is set to 1,
data in flash memory can be read only in program-verify/erase-verify mode. Access flash
memory only for verify operations (verification during programming/erasing). Also, do not
clear the SWE bit during programming, erasing, or verifying. Similarly, when using the RAM
emulation function, the SWE bit must be cleared before executing a program or reading data in
flash memory.
However, the RAM area overlapping flash memory space can be read and written to regardless
of whether the SWE bit is set or cleared.
All interrupt requests, including NMI, should be disabled during programming/erasing the
flash memory to give priority to program/erase operations.
In on-board programming, perform only one programming operation on a 128-byte
programming unit block. In programmer mode, too, perform only one programming operation
on a 128-byte programming unit block. Programming should be carried out with the entire
programming unit block erased.
Overcurrent damage to the device can result if the index marks on the PROM programmer
socket, socket adapter, and chip are not correctly aligned.
Touching either of these can cause contact faults and write errors.
The reset signal is applied at least 100 µs after the SWE bit has been cleared.
Rev. 2.0, 04/02, page 769 of 906