MC68HC708AS48 FREESCALE [Freescale Semiconductor, Inc], MC68HC708AS48 Datasheet - Page 201

• Manufacturer Part Number: MC68HC708AS48
• Description: Advance Information
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

15.7 Port E
15.7.1 Port E Data Register
MC68HC708AS48
MOTOROLA
—
Rev. 4.0
Function:
Alternate
Address:
Port E is an 8-bit special function port that shares two of its pins with the
timer interface module (TIM), two of its pins with the serial
communications interface module (SCI), and four of its pins with the
serial peripheral interface module (SPI).
The port E data register contains a data latch for each of the eight port
E pins.
PTE[7:0] — Port E Data Bits
SPSCK — SPI Serial Clock Bit
MOSI — Master Out/Slave In Bit
Reset:
Read:
Write:
PTE[7:0] 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 PTE7/SPSCK pin is the serial clock input of an SPI slave module
and serial clock output of an SPI master module. When the SPE bit is
clear, the PTE7/SPSCK pin is available for general-purpose I/O.
The PTE6/MOSI pin is the master out/slave in terminal of the SPI
module. When the SPE bit is clear, the PTE6/MOSI pin is available for
general-purpose I/O. (See
SPSCK
$0008
PTE7
Bit 7
Figure 15-14. Port E Data Register (PTE)
Input/Output (I/O) Ports
PTE6
MOSI
6
MISO
PTE5
5
18.14.1 SPI Control
Unaffected by Reset
PTE4
SS
4
TCH1
PTE3
3
TCH0
PTE2
2
Register.)
Input/Output (I/O) Ports
Advance Information
PTE1
RxD
1
PTE0
Bit 0
TxD
Port E
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