MC68HC711xxxx Motorola, MC68HC711xxxx Datasheet - Page 220
MC68HC711xxxx
Manufacturer Part Number
MC68HC711xxxx
Description
Microcontrollers
Manufacturer
Motorola
Datasheet
1.MC68HC711XXXX.pdf
(268 pages)
- Current page: 220 of 268
- Download datasheet (4Mb)
Application Note
220
Figure 3. MC68HC711E9 Bootloader Flowchart
INITIALIZATION:
SWITCH TO SLOWER SCI RATE...
CHANGE DELAY CONSTANT...
SP = TOP OF RAM ($01FF)
X = START OF REGS ($1000)
SPCR = $20 (SET DWOM BIT)
BAUD = $A2 (÷ 4; ÷ 4) (7812.5 BAUD @ 2 MHz)
SCCR2 = $C0 (Tx & Rx ON)
TOC1 = DELAY CONSTANT (539 = 4 SCI CHARACTER TIMES)
BAUD = $33 (÷13; ÷ 8) (1200 BAUD @ 2 MHz)
TOC1 = 3504 (4 SCI CHARACTER TIMES)
SET UP FOR PROGRAM UTILITY:
NO
X = PROGRAMMING TIME CONSTANT
Y = START OF EPROM
POINT TO START OF RAM ( Y = $0000 )
STORE RECEIVED DATA TO RAM ( ,Y )
NO
YES
POINT AT NEXT RAM LOCATION
TRANSMIT (ECHO) FOR VERIFY
DECREMENT TIMEOUT COUNT
RECEIVED FIRST CHAR YET ?
[7]
INITIALIZE TIMEOUT COUNT
RECEIVE DATA READY ?
[1]
FIRST CHAR = $00 ?
[10]
PAST END OF RAM ?
FIRST CHAR = $FF ?
TIMED OUT YET ?
WAIT
JUMP TO START
OF RAM ($0000)
SEND BREAK
NO
START
YES
NOTZERO
YES
NO
BAUDOK
WTLOOP
NO
YES
STAR
FROM RESET
IN BOOT MODE
[15]
[3]
[5]
YES
YES
[17]
NO
[14]
[8]
[9]
[12]
[13]
NOTE THAT A BREAK
CHARACTER IS ALSO
OF EEPROM ($B600)
[6]
[11]
RECEIVED AS $00
JUMP TO START
[16]
CYCLES
LOOP =
19
[4]
[2]
AN1060 — Rev. 1.0
MOTOROLA
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