Philips CEM2100/00, Service Manual

Page: 383 / 430

Page 261
T
5CL8
20.14Flowchart
ST
AR
T
Setup
Receive UAR
T data
Receive data =
5AH
Adjust the baud rate (Adjust the source clock to 9600 bps)
No
Ye
s
Transmit UAR
T data
(T
ransmit data = 5AH)
Receive UAR
T data
Modify the baud rate
based on the receive data
Receive data = 30H
(Flash memory writing mode)
Receive data = 60H
(RAM loader
mode)
Receive UAR
T data
(Intel Hex format)
Transmit UAR
T data
(Checksum of an entire area)
Receive UAR
T data
Transmit UAR
T data
(T
ransmit data = 60H)
Receive UAR
T data
(Intel Hex format)
Jump to the start address
of RAM program
Transmit UAR
T data
(Checksum of an entire area)
Receive data = C0H
(Product ID
code output mode)
Transmit UAR
T data
(T
ransmit data = C0H)
Flash memory write process
RAM write process
Transmit UAR
T data
(Product ID code)
Transmit UAR
T data
(Echo back the baud rate
modification data)
Verify the password (Compare the receive
data and flash memory data)
Security Program
check
Security disabled
Security Program
check
Security disabled
Infinite loop
Infinite loop
NG
Security Enable
NG
Receive data = C3H (Flash memory status
output mode)
Transmit UAR
T data
(T
ransmit data = C3H)
Receive data = F0H
(Flash memory erasing mode)
Transmit UAR
T data
(T
ransmit data = F0H)
Infinite loop
NG
Chip erase
(Erase on entire area)
Transmit UAR
T data
(Checksum of an entire area)
Receive data = F
AH
(Security Program
setting mode)
Transmit UAR
T data
(T
ransmit data = F
AH)
Security Program setting
Security Program check
Blank product check
Infinite loop
NG
Blank product check
Blank product check
Non-blank product
Non-blank product
OK
Blank product
OK
Blank product check
Non-blank product
OK
OK
Blank product check
Non-blank product
Blank product
Security Enable
Blank product
Disable Security Program
Blank product
Receive UAR
T data
Receive data
Sector erase (Block erase)
Upper 4 bits x 1000H
to
Lower 4 bits x 1000H Transmit UAR
T data
(Checksum of the erased area)
Upper 4 bits > Lower 4 bits
Transmit UAR
T data
(T
ransmit data = 30H)
Transmit UAR
T data
(T
ransmit data = 90H) Receive data = 90H (Flash memory sum
output mode)
Verify the password (Compare the receive
data and flash memory data)
Transmit UAR
T data
(Checksum)
Verify the password (Compare the receive
data and flash memory data)
Verify the password (Compare the receive
data and flash memory data)
Transmit UAR
T data
(Status of the Security
Program and blank product)
Transmit UAR
T data
(T
ransmit data = FBH)
Security Program
check
Upper 4 bits < Lower 4 bits
Security enabled
Infinite loop
Security disabled