MC68HC908GZ8 Datasheet, PDF (213/344 Pages) Motorola, Inc – Microcontrollers

Input/Output (I/O) Ports
Port E
17.5.3 Port D Input Pullup Enable Register
The port D input pullup enable register (PTDPUE) contains a software configurable
pullup device for each of the eight port D pins. Each bit is individually configurable
and requires that the data direction register, DDRD, bit be configured as an input.
Each pullup is automatically and dynamically disabled when a port bit’s DDRD is
configured for output mode.
Address: $000F
Bit 7
Read: _PTDPUE7
Write:
Reset:
0
6
PTDPUE6
0
5
PTDPUE5
0
4
PTDPUE4
0
3
PTDPUE3
0
2
PTDPUE2
0
1
PTDPUE1
0
Bit 0
PTDPUE0
0
Figure 17-16. Port D Input Pullup Enable Register (PTDPUE)
PTDPUE7–PTDPUE0 — Port D Input Pullup Enable Bits
These writable bits are software programmable to enable pullup devices on an
input port bit.
1 = Corresponding port D pin configured to have internal pullup
0 = Corresponding port D pin has internal pullup disconnected
17.6 Port E
Port E is a 6-bit special-function port that shares two of its pins with the enhanced
serial communications interface (ESCI) module.
17.6.1 Port E Data Register
The port E data register contains a data latch for each of the six port E pins.
Address: $0008
Bit 7
6
5
4
3
2
1
Bit 0
Read:
0
Write:
0
PTE5
PTE4
PTE3
PTE2
PTE1
PTE0
Reset:
Unaffected by reset
Alternate
Function:
RxD
TxD
= Unimplemented
Figure 17-17. Port E Data Register (PTE)
PTE5-PTE0 — Port E Data Bits
These read/write bits are software-programmable. Data direction of each port E
pin is under the control of the corresponding bit in data direction register E.
Reset has no effect on port E data.
MC68HC908GZ8
Freescale Semiconductor
Input/Output (I/O) Ports
Data Sheet
213