TMP89FH42 Datasheet, PDF (317/408 Pages) Toshiba Semiconductor – 8 Bit Microcontroller

TMP89FH42
21. Flash Memory
The TMP89FH42 has flash memory of 16384 bytes. A write and erase to be performed on flash memory can be
controlled in the following three modes:
- MCU mode
In MCU mode, the flash memory is accessed by the CPU control, and the flash memory can be executed
the erasing and writing without affecting the operations of a running application. Therefore, this mode is
used for software debugging and firmware change after shipment of the TMP89FH42.
- Serial PROM mode
In serial PROM mode, the flash memory is accessed by the CPU control. Use of the serial interface
(UART and SIO) enables the flash memory to be controlled by the small number of pins. The
TMP89FH42 used in serial PROM mode supports on-board programming, which enables users to pro-
gram flash memory after the microcontroller is mounted on a user board.
- Parallel PROM mode
The parallel PROM mode allows the flash memory to be accessed as a stand-alone flash memory by the
program writer provided by a third party. High-speed access to the flash memory is available by control-
ling address and data signals directly. To receive a support service for the program writer, please ask a
Toshiba sales representative.
In MCU and serial PROM modes, flash memory control registers (FLSCR1 and FLSCR2) are used to control the
flash memory. This chapter describes how to access the flash memory using the MCU and serial PROM modes.
RA003
Page 303