mc908jl16 Freescale Semiconductor, Inc, mc908jl16 Datasheet - Page 148

• Manufacturer Part Number: mc908jl16
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Input/Output (I/O) Ports
10.5.1 Port E Data Register (PTE)
The port E data register contains a data latch for each of the two port E pins.
PTE[1:0] — Port E Data Bits
T2CH1, T2CH0 — Timer 2 Channel I/Os
10.5.2 Data Direction Register E (DDRE)
Data direction register E determines whether each port E pin is an input or an output. Writing a logic 1 to
a DDRE bit enables the output buffer for the corresponding port E pin; a logic 0 disables the output buffer.
DDRE[1:0] — Data Direction Register E Bits
148
These read/write bits are software programmable. Data direction of each port E pin is under the control
of the corresponding bit in data direction register E. Reset has no effect on port D data.
The T2CH1 and T2CH0 pins are the TIM2 input capture/output compare pins. The edge/level select
bits, ELSxB:ELSxA, determine whether the PTE0/T2CH0 and PTE1/T2CH1 pins are timer channel I/O
pins or general-purpose I/O pins. See
These read/write bits control port E data direction. Reset clears DDRE[1:0], configuring all port E pins
as inputs.
1 = Corresponding port E pin configured as output
0 = Corresponding port E pin configured as input
Alternative Functions:
Address: $000C
Avoid glitches on port E pins by writing to the port E data register before
changing data direction register E bits from 0 to 1.
port E I/O logic.
Reset:
Read:
Write:
Address: $0008
Reset:
Read:
Write:
Bit 7
0
Figure 10-15. Data Direction Register E (DDRE)
Bit 7
= Unimplemented
Figure 10-14. Port E Data Register (PTE)
6
0
= Unimplemented
MC68HC908JL16 Data Sheet, Rev. 1.1
6
Chapter 6 Timer Interface Module
5
0
5
NOTE
4
0
Unaffected by reset
4
3
0
Figure 10-16
3
2
0
2
(TIM).
DDRE1
1
0
shows the
T2CH1
PTE1
1
Freescale Semiconductor
DDRE0
Bit 0
0
T2CH0
PTE0
Bit 0