Serial Prom Mode; Outline; Memory Mapping - Philips CEM2100/00 Service Manual

20. Serial PROM Mode

20.1 Outline

The T5CL8 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
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
Power supply
High frequency (Note)
Note: Though included in above operating range, some of high frequencies are not supported in the serial PROM mode. For
details, refer to "Table 20-5".

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 "Flash Memory Control Register".)
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
BOOTROM
Flash memory
Min
4.5
2
0000H
64 bytes
003FH
0040H
2048 bytes
083FH
0F80H
128 bytes
0FFFH
7800H
2048 bytes
7FFFH
8000H
9000H
28672 bytes 32768 bytes
(BANK0) (BANK1)
FFFFH
Serial PROM mode
Figure 20-1 Memory Address Maps
Page 233
Max
5.5
16
0000H
SFR
003FH
0040H
2048 bytes
RAM
083FH
0F80H
DBR
0FFFH
1000H
7FFFH
8000H
Flash memory 61440 bytes
FFFFH
MCU mode
T5CL8
pins. Communica-
RESET
Unit
V
MHz
64 bytes
128 bytes