MC908JB16DWE Datasheet, PDF (275/332 Pages) Freescale Semiconductor, Inc – Microcontrollers

Input/Output (I/O) Ports
14.6 Port E
Port E is a 5-bit special function port that shares three of its pins with the
timer interface modules (TIMs) and two of its pins with the USB data pins
D+ and D–. PTE4 and PTE3 are open-drain when configured as output.
14.6.1 Port E Data Register
The port E data register contains a data latch for each of the five
port E pins.
Address: $0008
Bit 7
6
Read: 0
0
Write:
Reset:
Alternative
Function:
Additional
Function:
Additional
Function:
5
4
3
2
1
Bit 0
0
PTE4 PTE3 PTE2 PTE1 PTE0
Unaffected by reset
D–
D+ T2CH01 T1CH01 TCLK
Optional Optional Optional Optional Optional
pullup pullup pullup pullup pullup
External
interrupt
Open-drain Open-drain
= Unimplemented
Figure 14-11. Port E Data Register (PTE)
PTE[4:0] — Port E Data Bits
PTE[4:0] 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 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 14.7 Port Options.)
MC68HC908JB16 — Rev. 1.1
Freescale Semiconductor
Input/Output (I/O) Ports
Technical Data
275