TMP86C909XB Toshiba, TMP86C909XB Datasheet - Page 152

• Manufacturer Part Number: TMP86C909XB
• Description: EMULATION CHIP FOR TMP86F SDIP
• Manufacturer: Toshiba

Specifications of TMP86C909XB

• Accessory Type: Adapter
• For Use With/related Products: TMP86F SDIP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

14.4 Access to the Flash Memory Area
14.4.1 Flash Memory Control in the Serial PROM Mode
formed in the entire flash memory area. Therefore, to perform these operations in the entire flash memory area,
access to the flash memory area by the control program in the BOOTROM or RAM area. (The flash memory pro-
gram cannot write to the flash memory.) The serial PROM or MCU mode is used to run the control program in the
BOOTROM or RAM area.
14.4.1.1 How to write to the flash memory by executing the control program in the RAM area (in
When the write, erase and read protections are set in the flash memory, read and fetch operations cannot be per-
Note 1: The flash memory can be written or read for each byte unit. Erase operations can be performed either in the entire
Note 2: To rewrite data to Flash memory addresses at which data (including FFH) is already written, make sure to erase
BOOTROM area. Since almost of all operations relating to access to the flash memory can be controlled sim-
ply by the communication data of the serial interface (UART), these functions are transparent to the user. For
the details of the serial PROM mode, see “Serial PROM Mode.”
command to execute the control program in the RAM area. The procedures to execute the control program in
the RAM area is shown in " 14.4.1.1 How to write to the flash memory by executing the control program in the
RAM area (in the RAM loader mode within the serial PROM mode) ".
To access to the flash memory by using peripheral functions in the serial PROM mode, run the RAM loader
The serial PROM mode is used to access to the flash memory by the control program provided in the
area or in units of 4 kbytes, whereas read operations can be performed by an one transfer instruction. However,
the command sequence method is adopted for write and erase operations, requiring several-byte transfer instruc-
tions for each operation.
the existing data by "sector erase" or "chip erase" before rewriting data.
the RAM loader mode within the serial PROM mode)
program executed in the RAM area.)
(Steps 1 and 2 are controlled by the BOOTROM, and steps 3 through 9 are controlled by the control
Note 1: Before writing to the flash memory in the RAM area, disable interrupts by setting the interrupt master
Note 2: Since the watchdog timer is disabled by the BOOTROM in the RAM loader mode, it is not required to
1. Transfer the write control program to the RAM area in the RAM loader mode.
2. Jump to the RAM area.
3. Disable (DI) the interrupt master enable flag (IMF←"0").
4. Set FLSCR<FLSMD> to "0011B" (to enable command sequence execution).
5. Execute the erase command sequence.
6. Read the same flash memory address twice.
7. Execute the write command sequence.
8. Read the same flash memory address twice.
9. Set FLSCR<FLSMD> to "1100B" (to disable command sequence execution).
(Repeat step 8 until the same data is read by two consecutive reads operations.)
enable flag (IMF) to "0". Usually disable interrupts by executing the DI instruction at the head of the
write control program in the RAM area.
disable the watchdog timer by the RAM loader program.
(Repeat step 6 until the same data is read by two consecutive reads operations.)
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