MC68HC908QT2CDW Freescale Semiconductor, MC68HC908QT2CDW Datasheet - Page 102

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MC68HC908QT2CDW

Manufacturer Part Number
MC68HC908QT2CDW
Description
IC MCU 1.5K FLASH W/ADC 8-SOIC
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet

Specifications of MC68HC908QT2CDW

Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Peripherals
LVD, POR, PWM
Number Of I /o
5
Program Memory Size
1.5KB (1.5K x 8)
Program Memory Type
FLASH
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
8-SOIC (5.3mm Width), 8-SOP, 8-SOEIAJ
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Data Converters
-
Connectivity
-
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.
Address: $000C
Bit 7
Read:
PTBPUE7
PTBPUE6
Write:
Reset:
0
Figure 12-8. Port B Input Pullup Enable Register (PTBPUE)
PTBPUE[7:0] — Port B Input Pullup Enable Bits
These read/write bits are software programmable to enable pullup devices on port B pins
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.
Table 12-3
summarizes the operation of the port B pins.
PTBPUE
DDRB
PTB
Bit
Bit
Bit
(1)
1
0
X
0
0
X
X
1
X
1. X = don’t care
2. I/O pin pulled to V
by internal pullup.
DD
3. Writing affects data register, but does not affect input.
4. Hi-Z = high impedance
102
6
5
4
3
PTBPUE5
PTBPUE4
PTBPUE3
0
0
0
0
Table 12-3. Port B Pin Functions
Accesses to DDRB
I/O Pin
Mode
Read/Write
(2)
Input, V
DDRB7–DDRB0
DD
(4)
DDRB7–DDRB0
Input, Hi-Z
Output
DDRB7–DDRB0
MC68HC908QY/QT Family Data Sheet, Rev. 6
2
1
Bit 0
PTBPUE2
PTBPUE2
PTBPUE0
0
0
0
Accesses to PTB
Read
Write
Pin
PTB7–PTB0
Pin
PTB7–PTB0
PTB7–PTB0
PTB7–PTB0
Freescale Semiconductor
(3)
(3)

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