MC68HC705C9ACFN Freescale Semiconductor, MC68HC705C9ACFN Datasheet - Page 40

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

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: -

Resets
5.4 Computer Operating Properly (COP) Reset
This device includes a watchdog COP feature which guards against program run-away failures. A timeout
of the computer operating properly (COP) timer generates a COP reset. The COP watchdog is a software
error detection system that automatically times out and resets the MCU if not cleared periodically by a
program sequence.
This device includes two COP types, one for C12A compatibility and the other for C9A compatibility. When
configured as a C9A the COP can be enabled by user software by setting COPE in the C9A COP control
register (C9ACOPCR). When configured as a C12A, the COP is enabled prior to operation by
programming the C12COPE bit in the C12A mask option register (C12MOR). The function and control of
both COPs is detailed below.
40
INTERNAL
ADDRESS
INTERNAL
INTERNAL
CLOCK
(C12A)
RESET
Notes:
BUS 1
RESET
DATA
BUS 1
(C9A)
OSC1
V
2. OSC1 line is not meant to represent frequency. It is only meant to represent time.
1. Internal timing signal and bus information are not available externally.
3. The next rising edge of the internal processor clock following the rising edge of RESET initiates the reset sequence.
4. RESET outputs V
DD
1
2
4064t
4
t
VDDR
CYC
3FFE
NEW
PCH
OL
during 4064 power-on reset cycles when in C9A mode only.
t CYC
MC68HC05C9A Advance Information Data Sheet, Rev. 4.1
3FFF
NEW
PCL
Figure 5-2. Power-On Reset and RESET
DUMMY
NEW
PC
CODE
NEW
OP
PC
3FFE
t
RL
t
RL
3
3
3FFE
3FFE
3FFE
PCH
3FFF
PCL
Freescale Semiconductor
DUMMY
NEW
PC
NEW
CODe
PC
OP