MC68HC705C9ACFN Freescale Semiconductor, MC68HC705C9ACFN Datasheet - Page 43

IC MCU 2.1MHZ 16K OTP 44-PLCC

MC68HC705C9ACFN

Manufacturer Part Number
MC68HC705C9ACFN
Description
IC MCU 2.1MHZ 16K OTP 44-PLCC
Manufacturer
Freescale Semiconductor
Series
HC05r
Datasheet

Specifications of MC68HC705C9ACFN

Core Processor
HC05
Core Size
8-Bit
Speed
2.1MHz
Connectivity
SCI, SPI
Peripherals
POR, WDT
Number Of I /o
24
Program Memory Size
16KB (16K x 8)
Program Memory Type
OTP
Ram Size
352 x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
44-PLCC
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Data Converters
-

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5.7 MC68HC05C12A Compatible COP Clear Register
The COP clear register, shown in
COPC — Computer Operating Properly Clear Bit
5.8 COP During Wait Mode
Either COP will continue to operate normally during wait mode. The software must pull the device out of
wait mode periodically and reset the COP to prevent a system reset.
5.9 COP During Stop Mode
Stop mode disables the oscillator circuit and thereby turns the clock off for the entire device. The COP
counter will be reset when stop mode is entered. If a reset is used to exit stop mode, the COP counter will
be reset after the 4064 cycles of delay after stop mode. If an IRQ is used to exit stop mode, the COP
counter will not be reset after the 4064-cycle delay and will have that many cycles already counted when
control is returned to the program.
In the event that an inadvertent STOP instruction is executed, neither COP will allow the system to
recover. The MC68HC705C9A offers two solutions to this problem, one available in C9A mode (see
Clock Monitor
5.9.1 Clock Monitor Reset
When configured as a C9A, the clock monitor circuit can provide a system reset if the clock stops for any
reason, including stop mode. When the CME bit in the C9A COP control register is set, the clock monitor
detects the absence of the internal bus clock for a certain period of time. The timeout period is dependent
on the processing parameters and varies from 5 µs to 100 µs, which implies that systems using a bus
clock rate of 200 kHz or less should not use the clock monitor.
If a slow or absent clock is detected, the clock monitor causes a system reset. The reset is issued to the
external system via the bidirectional RESET pin for four bus cycles if the clock is slow or until the clocks
recover in the case where the clocks are absent.
Freescale Semiconductor
Preventing a COP reset is achieved by writing a 0 to the COPC bit. This action will reset the counter
and begin the timeout period again. The COPC bit is bit 0 of address $3FF0. A read of address $3FF0
will result in the data programmed into the mask option register PBMOR.
$3FF0
Reset:
Reset) and one available in C12A mode (see
Read:
Write:
Bit 7
0
MC68HC05C9A Advance Information Data Sheet, Rev. 4.1
= Unimplemented
Figure 5-6. COP Clear Register (COPCLR)
6
0
Figure
5-6, resets the C12A COP counter.
5
0
U = Undetermined
U
4
3
0
5.9.2 STOP Instruction Disable
MC68HC05C12A Compatible COP Clear Register
2
0
1
0
COPC
Bit 0
0
Option).
5.9.1
43

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