MC68HC811E2FN Freescale Semiconductor, MC68HC811E2FN Datasheet - Page 200
MC68HC811E2FN
Manufacturer Part Number
MC68HC811E2FN
Description
Manufacturer
Freescale Semiconductor
Datasheet
1.MC68HC811E2FN.pdf
(242 pages)
Specifications of MC68HC811E2FN
Cpu Family
HC11
Device Core Size
8b
Frequency (max)
4MHz
Interface Type
SCI/SPI
Program Memory Type
ROMLess
Program Memory Size
Not Required
Total Internal Ram Size
256Byte
# I/os (max)
38
Number Of Timers - General Purpose
8
Operating Supply Voltage (typ)
3.3/5V
Operating Supply Voltage (max)
5.5V
Operating Supply Voltage (min)
3V
On-chip Adc
8-chx8-bit
Instruction Set Architecture
CISC
Operating Temp Range
0C to 70C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Pin Count
52
Package Type
PLCC
Lead Free Status / Rohs Status
Supplier Unconfirmed
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Main Bootloader Program
200
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 )
M68HC11 Bootstrap Mode, Rev. 1.1
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 ($0000)
SEND BREAK
NO
START
YES
NOTZERO
WTLOOP
YES
NO
BAUDOK
NO
YES
STAR
FROM RESET
IN BOOT MODE
[15]
[3]
[5]
YES
YES
[17]
NO
[14]
[8]
[9]
[12]
[13]
NOTE THAT A BREAK
CHARACTER IS ALSO
OF EEPROM ($B600)
[6]
RECEIVED AS $00
[11]
JUMP TO START
[16]
CYCLES
LOOP =
19
[4]
[2]
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