MC68HC708XL36 FREESCALE [Freescale Semiconductor, Inc], MC68HC708XL36 Datasheet - Page 294

• Manufacturer Part Number: MC68HC708XL36
• Description: HCMOS Microcontroller Unit
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

I/O Ports
Port E
Port E Data
Register
MC68HC708XL36
294
NOTE:
Function:
Alternate
Address: $0008
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).
PORTE contains the data latches for the eight port E pins.
PE[7:0] — Port E Data Bits
TCH[3:0] — Timer Channel I/O Bits
Data direction register E (DDRE) does not affect the data direction of
port E pins that are being used by the TIM. However, the DDRE bits
always determine whether reading port E returns the states of the
latches or the states of the pins. (See Table 6.)
Reset:
Read:
Write:
PE[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 PE7/TCH3–PE4/TCH0 pins are the TIM input capture/output
compare pins. The edge/level select bits, ELSxB:ELSxA, determine
whether the PE7/TCH3–PE4/TCH0 pins are timer channel I/O pins or
general-purpose I/O pins. (See
171.)
Freescale Semiconductor, Inc.
For More Information On This Product,
TCH3
Bit 7
PE7
Go to: www.freescale.com
Figure 14. Port E Data Register (PORTE)
TCH2
PE6
6
I/O Ports
TCH1
PE5
5
Unaffected by Reset
TCH0
PE4
4
Timer Interface Module
TCLK
PE3
3
PE2
TxD
2
PE1
RxD
1
on page
MOTOROLA
12-ports_a
Bit 0
PE0