Philips CEM2100/00, Service Manual

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Page 252
20. Serial PROM Mode
20.6 Operation Mode
T
5CL8
20.6.7 Flash Memory security program Setting Mode (Operation Command: FAH)
Table 20-13 shows Flash memory security program setting mode process.
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 " 20.10 Passwords ".
Note 3: If the security program is enabled for a blank product or a password error occurs for a non-blank product,
T5CL8
stops UART communication and enters the halt mode. In this case, initialize
T5CL8
by the
RESET
pin and reactivate the serial PROM mode.
Note 4: If an error occurs during reception of a password address or a password string,
T5CL8
stops UART communi-
cation and enters the halt mode. In this case, initialize
T5CL8
by the
RESET
pin and reactivate the serial PROM
mode.
Description of the Flash memory security program setting mode
1. The 1st through 4th bytes of the transmitted and received data contain 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 status output mode
(FAH).
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
Table 20-13 Flash Memory security program Setting Mode Process
Transfer Bytes
Transfer Data from External Con-
troller to
T5CL8
Baud Rate
Transfer Data from
T5CL8
to
External Controller
BOOT
ROM
1st byte
2nd byte Matching data (5AH)
- 9600 bps
9600 bps - (Automatic baud rate adjustment)
OK: Echo back data (5AH)
Error: Nothing transmitted
3rd byte
4th byte
Baud rate modification data
(See Table 20-4)
- 9600 bps
9600 bps
-
OK: Echo back data
Error: A1H
×
3, A3H
×
3, 62H
×
3 (Note 1)
5th byte
6th byte Operation command data (FAH)
- Modified baud rate
Modified baud rate -
OK: Echo back data (FAH)
Error: A1H
×
3, A3H
×
3, 63H
×
3 (Note 1)
7th byte
8th byte Password count storage address
15 to 08 (Note 2) Modified baud rate
Modified baud rate -
OK: Nothing transmitted
Error: Nothing transmitted
9th byte
10th byte Password count storage address
07 to 00 (Note 2) Modified baud rate
Modified baud rate -
OK: Nothing transmitted
Error: Nothing transmitted
11th byte
12th byte Password comparison start
address 15 to 08 (Note 2) Modified baud rate
Modified baud rate -
OK: Nothing transmitted
Error: Nothing transmitted
13th byte
14th byte Password comparison start
address 07 to 00 (Note 2) Modified baud rate
Modified baud rate -
OK: Nothing transmitted
Error: Nothing transmitted
15th byte
:
m’th byte Password string (Note 2)
-
Modified baud rate
Modified baud rate
-
OK: Nothing transmitted
Error: Nothing transmitted
n’th byte - Modified baud rate OK: FBH (Note 3)
Error: Nothing transmitted
n’+1th byte (Wait for the next operation com-
mand data) Modified baud rate -