mc68hc908mr32 Freescale Semiconductor, Inc, mc68hc908mr32 Datasheet - Page 108

• Manufacturer Part Number: mc68hc908mr32
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Input/Output (I/O) Ports (PORTS)
Figure 10-12
Reading address $0003 reads the voltage level on the pin.
port D pins.
10.6 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).
10.6.1 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
108
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.
Address:
shows the port D input logic.
Reset:
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.
Read:
Write:
$0008
PTE7
Bit 7
1. X = don’t care
2. Hi-Z = high impedance
3. Writing affects data register, but does not affect input.
READ PTD ($0003)
PTD Bit
MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1
X
(1)
Figure 10-13. Port E Data Register (PTE)
PTE6
6
Figure 10-12. Port D Input Circuit
Table 10-4. Port D Pin Functions
Input, Hi-Z
Pin Mode
PTE5
5
(2)
Unaffected by reset
NOTE
PTE4
4
Read
Pin
PTE3
Table 10-4
Accesses to PTD
3
PTE2
2
PTD[6:0]
summarizes the operation of the
Write
PTE1
1
(3)
Freescale Semiconductor
PTDx
PTE0
Bit 0