MC68HC908QT1VDW Freescale Semiconductor, MC68HC908QT1VDW Datasheet - Page 102

• Manufacturer Part Number: MC68HC908QT1VDW
• Description: 8-bit Microcontrollers - MCU 8 Bit 8MHz
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC908QT1VDW

• Product Category: 8-bit Microcontrollers - MCU
• Core: HC08
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 8 MHz
• Program Memory Size: 1.5 KB
• Data Ram Size: 128 B
• On-chip Adc: No
• Operating Supply Voltage: 3.3 V to 5.5 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: SOIC-8
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 6
• Number Of Timers: 2
• Program Memory Type: Flash
• Factory Pack Quantity: 96
• Supply Voltage - Max: 5.5 V
• Supply Voltage - Min: 2.7 V

Input/Output Ports (PORTS)
12.3.3 Port B Input Pullup Enable Register
The port B input pullup enable register (PTBPUE) contains a software configurable pullup device for each
of the eight port B pins. Each bit is individually configurable and requires the corresponding data direction
register, DDRBx, be configured as input. Each pullup device is automatically and dynamically disabled
when its corresponding DDRBx bit is configured as output.
PTBPUE[7:0] — Port B Input Pullup Enable Bits
102
Table 12-3
1. X = don’t care
2. I/O pin pulled to V
3. Writing affects data register, but does not affect input.
4. Hi-Z = high impedance
PTBPUE
These read/write bits are software programmable to enable pullup devices on port B pins
Bit
X
1
0
1 = Corresponding port B pin configured to have internal pull if its DDRB bit is set to 0
0 = Pullup device is disconnected on the corresponding port B pin regardless of the state of its
DDRB bit.
summarizes the operation of the port B pins.
Address: $000C
DDRB
Reset:
Read:
Write:
Bit
0
0
1
DD
Figure 12-8. Port B Input Pullup Enable Register (PTBPUE)
PTBPUE7
by internal pullup.
Bit 7
0
PTB
X
Bit
X
X
(1)
PTBPUE6
MC68HC908QY/QT Family Data Sheet, Rev. 6
Input, Hi-Z
6
0
Input, V
Table 12-3. Port B Pin Functions
I/O Pin
Output
Mode
PTBPUE5
DD
(2)
(4)
0
5
PTBPUE4
Accesses to DDRB
4
0
DDRB7–DDRB0
DDRB7–DDRB0
DDRB7–DDRB0
Read/Write
PTBPUE3
3
0
PTBPUE2
2
0
PTB7–PTB0
PTBPUE2
Read
Pin
Pin
1
0
Accesses to PTB
Freescale Semiconductor
PTBPUE0
Bit 0
0
PTB7–PTB0
PTB7–PTB0
PTB7–PTB0
Write
(3)
(3)