MC68HC08JB1 Datasheet, PDF (173/216 Pages) Motorola, Inc – Microcontrollers

11.6 Port E
Port E is a 3-bit special function port that shares one of its pins with the
timer interface module (TIM) and two of its pins with the USB data pins
D+ and D–. PTE4 and PTE3 are open-drain when configured as output.
11.6.1 Port E Data Register
The port E data register contains a data latch for each of the three port E
pins.
Address: $0008
Bit 7
6
Read: 0
0
Write:
Reset:
Alternative
Function:
Additional
Function:
Additional
Function:
5
4
3
2
0
0
PTE4 PTE3
Unaffected by reset
D–
D+
Optional Optional
pullup pullup
External
interrupt
Open-drain Open-drain
1
Bit 0
0
PTE1
TCH0
Optional
pullup
= Unimplemented
Figure 11-11. Port E Data Register (PTE)
PTE4, PTE3, PTE1 — Port E Data Bits
PTE4, PTE3, and PTE1 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 PTE4 and PTE3 pullup enable bits, PTE4P and PTE3P, in the
port option control register (POCR) enable 5kΩ pullups on PTE4 and
PTE3 if the respective pin is configured as an input and the USB
module is disabled. (See 11.7 Port Options.)
MC68HC08JB1 — Rev. 2.1
Freescale Semiconductor
Technical Data
173