MC68HC711E20CFN3 Freescale Semiconductor, MC68HC711E20CFN3 Datasheet - Page 200

• Manufacturer Part Number: MC68HC711E20CFN3
• Description: IC MCU 3MHZ 20K OTP 52-PLCC
• Manufacturer: Freescale Semiconductor
• Series: HC11r

Specifications of MC68HC711E20CFN3

• Core Processor: HC11
• Core Size: 8-Bit
• Speed: 3MHz
• Connectivity: SCI, SPI
• Peripherals: POR, WDT
• Number Of I /o: 38
• Program Memory Size: 20KB (20K x 8)
• Program Memory Type: OTP
• Eeprom Size: 512 x 8
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 52-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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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