MC68HC908AB32CFU Freescale Semiconductor, MC68HC908AB32CFU Datasheet - Page 318

• Manufacturer Part Number: MC68HC908AB32CFU
• Description: IC MCU 8MHZ 32K FLASH 64-QFP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908AB32CFU

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI, SPI
• Peripherals: POR, PWM
• Number Of I /o: 51
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 512 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: 64-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Input/Output (I/O) Ports
17.4 Port B
17.4.1 Port B Data Register (PTB)
Technical Data
318
NOTE:
Alternative Function:
Address:
Port B is an 8-bit special function port that shares all eight of its port pins
with the analog-to-digital converter (ADC) module (see
Analog-to-Digital Converter
The port B data register contains a data latch for each of the eight port B
pins.
PTB[7:0] — Port B Data Bits
ATD[7:0] — ADC channels
Care must be taken when reading port B while applying analog voltages
to ATD[7:0] pins. If the appropriate ADC channel is not enabled,
excessive current drain may occur if analog voltages are applied to the
PTBx/ATDx pin, while PTB is read as a digital input. Those ports not
selected as analog input channels are considered digital I/O ports.
Reset:
Read:
Write:
These read/write bits are software programmable. Data direction of
each port B pin is under the control of the corresponding bit in data
direction register B. Reset has no effect on port B data.
ATD[7:0] are pins used for the input channels to the analog-to-digital
converter module. The channel select bits in the ADC status and
control register define which port B pin will be used as an ADC input
and overrides any control from the port I/O logic by forcing that pin as
the input to the analog circuitry.
$0001
PTB7
ATD7
Bit 7
Figure 17-5. Port B Data Register (PTB)
Input/Output (I/O) Ports
PTB6
ATD6
6
PTB5
ATD5
5
(ADC)).
Unaffected by reset
PTB4
ATD4
4
PTB3
ATD3
3
MC68HC908AB32
PTB2
ATD2
Freescale Semiconductor
2
Section 14.
PTB1
ATD2
1
—
Rev. 1.1
PTB0
ATD0
Bit 0