mc68hc908gp20 Freescale Semiconductor, Inc, mc68hc908gp20 Datasheet - Page 241

• Manufacturer Part Number: mc68hc908gp20
• Description: M68hc08 Family Of 8-bit Microcontroller Units Mcus
• Manufacturer: Freescale Semiconductor, Inc

16.7.1 Port E Data Register
MC68HC908GP20
Freescale Semiconductor
NOTE:
—
Rev 2.1
Function:
Alternate
Address:
The port E data register contains a data latch for each of the two port E
pins.
PTE1 and PTE0 — Port E Data Bits
Data direction register E (DDRE) does not affect the data direction of
port E pins that are being used by the SCI module. However, the DDRE
bits always determine whether reading port E returns the states of the
latches or the states of the pins. See
RxD — SCI Receive Data Input
TxD — SCI Transmit Data Output
Reset:
Read:
Write:
PTE1 and PTE0 are read/write, software programmable bits. Data
direction of each port E pin is under the control of the corresponding
bit in data direction register E.
The PTE1/RxD pin is the receive data input for the SCI module. When
the enable SCI bit, ENSCI, is clear, the SCI module is disabled, and
the PTE1/RxD pin is available for general-purpose I/O. See
18. Serial Communications Interface Module
The PTE0/TxD pin is the transmit data output for the SCI module.
When the enable SCI bit, ENSCI, is clear, the SCI module is disabled,
and the PTE0/TxD pin is available for general-purpose I/O. See
Section 18. Serial Communications Interface Module
$0008
Bit 7
0
Figure 16-17. Port E Data Register (PTE)
= Unimplemented
6
0
5
0
Unaffected by reset
4
0
Table
3
0
16-6.
(SCI).
2
0
Advance Information
PTE1
RxD
1
(SCI).
Section
PTE0
Bit 0
TxD
241