TMP88FW45FG Datasheet, PDF (248/276 Pages) Toshiba Semiconductor – 8 Bit Microcontroller

20. Serial PROM Mode
20.6 Operation Mode
TMP88FW45FG
20.6.4 Flash Memory SUM Output Mode (Operation Command: 90H)
Table 20-10 shows flash memory SUM output mode process.
Table 20-10 Flash Memory SUM Output Process
Transfer Bytes
1st byte
2nd byte
Transfer Data from External Control-
ler to TMP88FW45FG
Baud Rate
Matching data (5AH)
-
9600 bps
9600 bps
3rd byte
4th byte
Baud rate modification data
(See Table 20-4)
-
9600 bps
9600 bps
BOOT
ROM
5th byte
6th byte
7th byte
Operation command data (90H)
-
-
Modified baud rate
Modified baud rate
Modified baud rate
8th byte
-
Modified baud rate
9th byte
(Wait for the next operation com-
mand data)
Modified baud rate
Transfer Data from TMP88FW45FG to
External Controller
- (Automatic baud rate adjustment)
OK: Echo back data (5AH)
Error: Nothing transmitted
-
OK: Echo back data
Error: A1H × 3, A3H × 3, 62H × 3 (Note 1)
-
OK: Echo back data (90H)
Error: A1H × 3, A3H × 3, 63H × 3 (Note 1)
OK: SUM (Upper byte) (Note 2)
Error: Nothing transmitted
OK: SUM (Lower byte) (Note 2)
Error: Nothing transmitted
-
Note 1: “xxH × 3” indicates that the device enters the halt condition after sending 3 bytes of xxH. For details, refer to " 20.7 Error
Code ".
Note 2: Refer to " 20.8 Checksum (SUM) ".
Description of the flash memory SUM output mode
1. The 1st through 4th bytes of the transmitted and received data contains the same data as in the flash
memory writing mode.
2. The 5th byte of the received data contains the command data in the flash memory SUM output mode
(90H).
3. When the 5th byte of the received data contains the operation command data shown in Table 1-6, the
device echoes back the value which is the same data in the 6th byte position of the received data (in
this case, 90H). If the 5th byte of the received data does not contain the operation command data, the
device enters the halt condition after transmitting 3 bytes of operation command error code (63H).
4. The 7th and the 8th bytes contain the upper and lower bits of the checksum, respectively. For how to
calculate the checksum, refer to " 20.8 Checksum (SUM) ".
5. After sending the checksum, the device waits for the next operation command data.
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