MC68HC711P2CFN4 Freescale Semiconductor, MC68HC711P2CFN4 Datasheet - Page 43

• Manufacturer Part Number: MC68HC711P2CFN4
• Description: IC MCU 32K OTP 4MHZ 84-PLCC
• Manufacturer: Freescale Semiconductor
• Series: HC11r

Specifications of MC68HC711P2CFN4

• Core Processor: HC11
• Core Size: 8-Bit
• Speed: 4MHz
• Connectivity: MI Bus, SCI, SPI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 50
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: OTP
• Eeprom Size: 640 x 8
• Ram Size: 1K 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: 84-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

3.3.4 Special bootstrap mode
MC68HC11P2 — Rev 1.0
When the MCU is reset in special bootstrap mode, a small on-chip ROM
is enabled at address $BE40–$BFFF. The ROM contains a reset vector
and a bootloader program. The MCU fetches the reset vector, then
executes the bootloader.
For normal use of the bootloader program, send a synchronization byte
$FF to the SCI receiver at either E clock ÷256, or E clock ÷1664 (7812
or 1200 baud respectively, for an E clock of 2MHz). Then download up
to 1024 bytes of program data (which is put into RAM starting at $0080).
These characters are echoed through the transmitter. The bootloader
program ends the download after a timeout of four character times or
1024 bytes. When loading is complete, the program jumps to location
$0080 and begins executing the code. Use of an external pull-up resistor
is required when using the SCI transmitter pin (TXD) because port D pins
are configured for wired-OR operation by the bootloader. In bootstrap
mode, the interrupt vectors point to RAM. This allows the use of
interrupts through a jump table.
Further baud rate options are available on the MC68HC11P2 by using a
different value for the synchronization byte, as shown in
also to Motorola application note AN1060, M68HC11 Bootstrap Mode
(the bootloader mode is similar to that used on the MC68HC11K4).
Sync.
byte
Freescale Semiconductor, Inc.
$FF
$FF
$FD
$FD
$F0
For More Information On This Product,
Operating Modes and On-Chip Memory
Timeout
4 char.
delay
17.3
4.9
Go to: www.freescale.com
13
4
Table 3-1. Example bootloader baud rates
2.00MHz
7812
1200
9600
5208
3906
2.10MHz
10080
8192
1260
5461
4096
Baud rates for an E clock of:
Operating Modes and On-Chip Memory
3.00MHz
14400
11718
1800
7812
5859
3.15MHz
12288
15120
8192
1890
6144
Table
Operating modes
Technical Data
3-1. Refer
4.00MHz
15624
19200
10416
2400
7812