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| TMP86FS49BFG Datasheet, PDF (249/294 Pages) Toshiba Semiconductor – 8 Bit Microcontroller | |||
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TMP86FS49BFG
20. Serial PROM Mode
20.1 Outline
The TMP86FS49BFG has a 2048 byte BOOTROM (Mask ROM) for programming to flash memory. The
BOOTROM is available in the serial PROM mode, and controlled by TEST, BOOT and RESET pins. Communica-
tion is performed via UART. The serial PROM mode has seven types of operating mode: Flash memory writing,
RAM loader, Flash memory SUM output, Product ID code output, Flash memory status output, Flash memory eras-
ing and Flash memory security program setting. Memory address mapping in the serial PROM mode differs from
that in the MCU mode. Figure 20-1 shows memory address mapping in the serial PROM mode.
Table 20-1 Operating Range in the Serial PROM Mode
Parameter
Min
Power supply
4.5
High frequency (Note)
2
Max
Unit
5.5
V
16
MHz
Note: Though included in above operating range, some of high frequencies are not supported in the serial PROM mode. For
details, refer to âTable 20-5â.
20.2 Memory Mapping
The Figure 20-1 shows memory mapping in the Serial PROM mode and MCU mode.
In the serial PROM mode, the BOOTROM (Mask ROM) is mapped in addresses from 7800H to 7FFFH. The flash
memory is divided into two banks for mapping. Therefore, when the RAM loader mode (60H) is used, it is required
to specify the flash memory address according to Figure 20-1 (For detail of banks and control register, refer to the
chapter of âFlash Memory Control Registerâ.)
To use the Flash memory writing command (30H), specify the flash memory addresses from 1000H to FFFFH, that
is the same addresses in the MCU mode, because the BOOTROM changes the flash memory address.
SFR
RAM
DBR
0000H
003FH
0040H
083FH
0F80H
0FFFH
64 bytes
2048 bytes
128 bytes
SFR
RAM
DBR
0000H
003FH
0040H
083FH
0F80H
0FFFH
1000H
BOOTROM
7800H
7FFFH
8000H
9000H
2048 bytes
Flash memory
28672 bytes 32768 bytes
(BANK0) (BANK1)
FFFFH
Serial PROM mode
7FFFH
Flash memory 8000H
FFFFH
Figure 20-1 Memory Address Maps
64 bytes
2048 bytes
128 bytes
61440 bytes
MCU mode
Page 233
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