MC68HC705JP7CDW Freescale Semiconductor, MC68HC705JP7CDW Datasheet - Page 79

• Manufacturer Part Number: MC68HC705JP7CDW
• Description: IC MCU 8BIT 28-SOIC
• Manufacturer: Freescale Semiconductor
• Series: HC05r

Specifications of MC68HC705JP7CDW

• Core Processor: HC05
• Core Size: 8-Bit
• Speed: 2.1MHz
• Connectivity: SIO
• Peripherals: POR, Temp Sensor, WDT
• Number Of I /o: 22
• Program Memory Size: 6KB (6K x 8)
• Program Memory Type: OTP
• Ram Size: 224 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 4x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

ISEN
8.4 Analog Status Register
The analog status register (ASR) contains status and control of the comparator flag bits. These bits in the
ASR are shown in
CPF2
CPF1
Freescale Semiconductor
The ISEN enable bit will power down the charge current source and disable the discharge device in
the analog subsystem. Powering down the current source will drop the supply current by about 200
µA. This bit is cleared by a reset of the device.
This read-only flag bit is edge sensitive to the rising output of comparator 2. It is set when the voltage
on the PB0/AN0 pin rises above the voltage on a sample capacitor which creates a positive edge on
the output of comparator 2, regardless of the state of the INV bit in the AMUX register. This bit is reset
by writing a logic 1 to the CPFR2 reset bit in the ASR. This bit is cleared by a reset of the device.
This read-only flag bit is edge sensitive to the rising output of comparator 1. It is set when the voltage
on the PB2/AN2 pin rises above the voltage on the PN3/AN3/TCAP pin which creates a positive edge
on the output of comparator 1, regardless of the state of the INV bit in the AMUX register. This bit is
reset by writing a logic 1 to the CPFR1 reset bit in the ASR. This bit is cleared by a reset of the device.
1 = Writing a logic 1 powers up the ramping current source and enables the discharge device on
0 = Writing a logic 0 powers down the ramping current source and disables the discharge device on
1 = A positive transition on the output of comparator 2 has occurred since the last time the CPF2
0 = A positive transition on the output of comparator 2 has not occurred since the last time the CPF2
1 = A positive transition on the output of comparator 1 has occurred since the last time the CPF1
0 = A positive transition on the output of comparator 1 has not occurred since the last time the CPF1
the PB0/AN0 pin.
the PB0/AN0 pin.
flag has been cleared.
flag has been cleared.
flag has been cleared.
flag has been cleared.
Address:
The analog subsystem has support circuitry which draws current. This
current will be powered down if both comparators and the charge current
source are powered down (ISEN, CP1EN, and CP2EN all cleared).
Powering up either comparator or the charge current source will activate
the support circuitry.
Reset:
Read:
Write:
Figure
MC68HC705JJ7 • MC68HC705JP7 Advance Information Data Sheet, Rev. 4.1
$001E
CPF2
Bit 7
0
8-6. All the bits in this register are cleared by a reset of the device.
Figure 8-6. Analog Status Register (ASR)
= Unimplemented
CPF1
6
0
CPFR2
5
0
0
NOTE
CPFR1
4
0
0
COE1
R
3
0
= Reserved
VOFF
2
0
CMP2
1
0
Analog Status Register
CMP1
Bit 0
R
0
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