MC68HC08AS32 Datasheet, PDF (197/394 Pages) Motorola, Inc – M68HC08 Family of 8-bit microcontroller units (MCUs)

15.7 Port E
Input/Output (I/O) Ports
Port E
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).
15.7.1 Port E Data Register
The port E data register contains a data latch for each of the eight port
E pins.
Address: $0008
Bit 7
6
5
4
3
2
1
Read:
PTE7
Write:
PTE6
PTE5
PTE4
PTE3
PTE2
PTE1
Reset:
Unaffected by Reset
Alternate
Function:
SPSCK
MOSI
MISO
SS
TCH1 TCH0 RxD
Figure 15-13. Port E Data Register (PTE)
Bit 0
PTE0
TxD
PTE[7:0] — Port E Data Bits
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.
SPSCK — SPI Serial Clock Bit
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.
MOSI — Master Out/Slave In Bit
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 18.14.1 SPI Control Register.)
MC68HC08AS32 — Rev. 3.0
MOTOROLA
Input/Output (I/O) Ports
Advance Information
197