Intel Hex Format (Binary); Passwords - Philips CEM2100/00 Service Manual

20. Serial PROM Mode

20.9 Intel Hex Format (Binary)

20.9 Intel Hex Format (Binary)
1. After receiving the checksum of a data record, the device waits for the start mark (3AH ":") of the next data
record. After receiving the checksum of a data record, the device ignores the data except 3AH transmitted
by the external controller.
2. After transmitting the checksum of end record, the external controller must transmit nothing, and wait for
the 2-byte receive data (upper and lower bytes of the checksum).
3. If a receiving error or Intel Hex format error occurs, the device enters the halt condition without returning
an error code to the external controller. The Intel Hex format error occurs in the following case:

20.10Passwords

The consecutive eight or more-byte data in the flash memory area can be specified to the password.
T5CL8
external controller. The area in which passwords can be specified is located at addresses 1000H to FF9FH. The area
from FFA0H to FFFFH can not be specified as the passwords area.
If addresses from FFE0H through FFFFH are filled with "FFH", the passwords are not compared because the
product is considered as a blank product. Even in this case, the password count storage addresses and password
comparison start address must be specified. Table 20-16 shows the password setting in the blank product and non-
blank product.
Table 20-16 Password Setting in the Blank Product and Non-Blank Product
(Password count storage address)
(Password comparison start address)
Password string setting
Note 1: When addresses from FFE0H through FFFFH are filled with "FFH", the product is recognized as a blank product.
Note 2: The data including the same consecutive data (three or more bytes) can not be used as a password. (This causes a pass-
word error data.
Note 3: *: Don't care.
Note 4: When the above condition is not met, a password error occurs. If a password error occurs, the device enters the halt con-
dition without returning the error code.
Note 5: In the flash memory writing mode or RAM loader mode, the blank product receives the Intel Hex format data immediately
after receiving PCSA without receiving password strings. In this case, the subsequent processing is performed correctly
because the blank product ignores the data except the start mark (3AH ":") as the Intel Hex format data, even if the exter-
nal controller transmits the dummy password string. However, if the dummy password string contains "3AH", it is detected
as the start mark erroneously. The microcontroller enters the halt mode. If this causes the problem, do not transmit the
dummy password strings.
Note 6: In the flash memory erasing mode, the external controller must not transmit the password string for the blank product.
When the record type is not 00H, 01H, or 02H
When a checksum error occurs
When the data length of an extended record (record type = 02H) is not 02H
When the device receives the data record after receiving an extended record (record type = 02H) with
extended address of 1000H or larger.
When the data length of the end record (record type = 01H) is not 00H
compares the data string specified to the password with the password string transmitted from the
Password
PNSA
PCSA
N
(Password count)
T5CL8
Blank Product (Note 1)
1000H ≤ PNSA ≤ FF9FH
1000H ≤ PCSA ≤ FF9FH
*
Not required (Note 5)
transmits no data and enters the halt condition.)
Page 256
T5CL8
Non-Blank Product
1000H ≤ PNSA ≤ FF9FH
1000H ≤ PCSA ≤ FFA0 - N
8 ≤ N
Required (Note 2)