Fujitsu FR60 Hardware Manual page 524

CHAPTER 19 PROGRAM LOADER MODE (SUPPORTED ONLY BY THE MB91302A (IPL INTEGRATED MODEL))
❍ Subroutine "Command reception" in Asynchronous mode
1- byte data reception (command data)
8 - byte data reception
(Download information data)
Download destination address 4 bytes
+
Number of download bytes 4 bytes
One - byte data reception (checksum data)
504
Receive command
Receive Data ?
1 - byte data reception (command data)
Received data = 18
Receive Data ?
1- byte data reception (Download information data)
Increment the received data storage address
Count the number of reception times
Number of reception times = 8 ?
( 8 - byte data reception )
Receive Data ?
1-byte data reception (Checksum data ) :
The lower eight bits are fetched from command data
and download information data
(amounting to nine bytes).
:
? (Checksum)
EXIT
NO NO
YES
YES
?
H
NO
NO
YES
NO
YES
NO
YES
added together
NO
YES
RESET
Checksum error