s908qy2ad1vdwer Freescale Semiconductor, Inc, s908qy2ad1vdwer Datasheet - Page 106

• Manufacturer Part Number: s908qy2ad1vdwer
• Description: Mc68hc908qt4a Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Input/Output Ports (PORTS)
12.3.4 Port A Summary Table
The following table summarizes the operation of the port A pins when used as a general-purpose
input/output pins.
12.4 Port B
Port B is an 8-bit special function port that shares two of its pins with the 10-bit ADC (see
Analog-to-Digital Converter (ADC10)
Each port B pin also has a software configurable pullup device if the corresponding port pin is configured
as an input port.
12.4.1 Port B Data Register
The port B data register (PTB) contains a data latch for each of the port B pins.
PTB[7:0] — Port B Data Bits
106
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
5. Output does not apply to PTA2
PTAPUE
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.
Bit
X
1
0
Reset:
Read:
Write:
DDRA
Bit
0
0
1
DD
by internal pullup.
PTB7
Bit 7
PTA
X
Bit
X
X
(1)
PTB6
Figure 12-5. Port B Data Register (PTB)
MC68HC908QYA/QTA Family Data Sheet, Rev. 2
6
Input, V
Input, Hi-Z
Table 12-1. Port A Pin Functions
I/O Pin
Output
Mode
Module).
DD
PTB5
5
(2)
(4)
Unaffected by reset
PTB4
4
Accesses to DDRA
DDRA5–DDRA0
DDRA5–DDRA0
DDRA5–DDRA0
Read/Write
PTB3
3
PTB2
2
PTA5–PTA0
PTB1
Read
1
Pin
Pin
Accesses to PTA
Freescale Semiconductor
PTB0
Bit 0
PTA5–PTA0
PTA5–PTA0
PTA5–PTA0
Chapter 3
Write
(3)
(3)
(5)