MC68HC908GP32CP Freescale Semiconductor, MC68HC908GP32CP Datasheet - Page 221

• Manufacturer Part Number: MC68HC908GP32CP
• Description: IC MCU 8MHZ 32K FLASH 40-DIP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908GP32CP

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI, SPI
• Peripherals: LVD, POR, PWM
• Number Of I /o: 33
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• For Use With: M68EVB908GP32 - BOARD EVALUATION FOR HC908GP32
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

16.4 Port B
16.4.1 Port B Data Register
MC68HC908GP32
MOTOROLA
NOTE:
•
MC68HC08GP32
Function:
Address:
Alternate
Port B is an 8-bit special-function port that shares all eight of its pins with
the analog-to-digital converter (ADC) module.
The port B data register (PTB) contains a data latch for each of the eight
port pins.
PTB7–PTB0 — Port B Data Bits
AD7–AD0 — Analog-to-Digital Input Bits
Care must be taken when reading port B while applying analog voltages
to AD7–AD0 pins. If the appropriate ADC channel is not enabled,
excessive current drain may occur if analog voltages are applied to the
PTBx/ADx 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.
AD7–AD0 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
Bit 7
AD7
Rev. 6
Figure 16-6. Port B Data Register (PTB)
Input/Output (I/O) Ports
PTB6
AD6
6
PTB5
AD5
5
Unaffected by reset
PTB4
AD4
4
PTB3
AD3
3
PTB2
AD2
2
Input/Output (I/O) Ports
PTB1
AD1
1
Technical Data
PTB0
Bit 0
AD0
Port B
219