MC68HC711E9CFN3 Freescale Semiconductor, MC68HC711E9CFN3 Datasheet - Page 315
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MC68HC711E9CFN3
Manufacturer Part Number
MC68HC711E9CFN3
Description
IC MCU 3MHZ 12K OTP 52-PLCC
Manufacturer
Freescale Semiconductor
Series
HC11r
Specifications of MC68HC711E9CFN3
Core Processor
HC11
Core Size
8-Bit
Speed
3MHz
Connectivity
SCI, SPI
Peripherals
POR, WDT
Number Of I /o
38
Program Memory Size
12KB (12K x 8)
Program Memory Type
OTP
Eeprom Size
512 x 8
Ram Size
512 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
Available stocks
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Part Number:
MC68HC711E9CFN3
Manufacturer:
MOTOROLA/摩托罗拉
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20 000
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Bootloading
a Program
to Perform
a ROM Checksum
Inherent Delays
Caused
by Double
Buffering
of SCI Data
AN1060 — Rev. 1.0
MOTOROLA
The port pins that are used for EPROM data I/O lines may be inputs or
outputs, depending on the pin that is emulating the EPROM output
enable pin (OE). To make these data pins appear as high-impedance
inputs as they would on a non-EPROM part in reset, connect the
PB7/(OE) pin to a pullup resistor.
The bootloader ROM must be turned off before performing the
checksum program. To remove the boot ROM from the memory map,
clear the RBOOT bit in the HPRIO register. This is normally a write-
protected bit that is 0, but in bootstrap mode it is reset to 1 and can be
written. If the boot ROM is not disabled, the checksum routine will read
the contents of the boot ROM rather than the user’s mask ROM or
EPROM at the same addresses.
This problem is troublesome in cases where one MCU is bootloading to
another MCU.
Because of transmitter double buffering, there may be one character in
the serial shifter as a new character is written into the transmit data
register. In cases such as downloading in which this 2-character pipeline
is kept full, a 2-character time delay occurs between when a character is
written to the transmit data register and when that character finishes
transmitting. A little more than one more character time delay occurs
between the target MCU receiving the character and echoing it back. If
the master MCU waits for the echo of each downloaded character before
sending the next one, the download process takes about twice as long
as it would if transmission is treated as a separate process or if verify
data is ignored.
Application Note
315
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