mc68hc08qa24 Freescale Semiconductor, Inc, mc68hc08qa24 Datasheet - Page 201

• Manufacturer Part Number: mc68hc08qa24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

16.7 Port E
16.7.1 Port E Data Register
MC68HC08QA24
Freescale Semiconductor
Function:
Address:
Alternate
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 16-14. Port E Data Register (PTE)
Input/Output (I/O) Ports
MOSI
PTE6
6
PTE5
MISO
5
18.14.1 SPI Control
Unaffected by reset
PTE4
SS
4
TACH1
PTE3
3
TACH0
PTE2
Register.)
2
Input/Output (I/O) Ports
PTE1
RxD
Technical Data
1
PTE0
Bit 0
TxD
199