
Input/Output (I/O) Ports
MC68HC908MR24 — Rev. 4.1
Advance Information
Freescale Semiconductor
Input/Output (I/O) Ports
331
15.7 Port E
Port E is an 8-bit, special function port that shares five of its pins with the
timer interface module (TIM) and two of its pins with the serial
communications interface module (SCI).
15.7.1 Port E Data Register
The port E data register (PTE) contains a data latch for each of the eight
port E pins.
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.
NOTE:
Data direction register E (DDRE) does not affect the data direction of
port E pins that are being used by the TIMA or TIMB. However, the
DDRE bits always determine whether reading port E returns the states
of the latches or the states of the pins.
Address:
$0008
Bit 7
6
5
4
3
2
1
Bit 0
Read:
PTE7
PTE6
PTE5
PTE4
PTE3
PTE2
PTE1
PTE0
Write:
Reset:
Unaffected by reset
Figure 15-13. Port E Data Register (PTE)