MC908JL8CDWE Datasheet, PDF (162/212 Pages) Freescale Semiconductor, Inc – Microcontrollers

Input/Output (I/O) Ports
When DDREx is a logic 1, reading address $0008 reads the PTEx data latch. When DDREx is a logic 0,
reading address $0008 reads the voltage level on the pin. The data latch can always be written,
regardless of the state of its data direction bit. Table 11-5 summarizes the operation of the port E pins.
Table 11-5. Port E Pin Functions
DDRE Bit
0
PTE Bit
X⁽¹⁾
I/O Pin Mode
Input, Hi-Z⁽²⁾
Accesses to DDRE
Read/Write
DDRE[1:0]
1
X
Output
DDRE[1:0]
1. X = don’t care.
2. Hi-Z = high impedance.
3. Writing affects data register, but does not affect the input.
Accesses to PTE
Read
Pin
Write
PTE[1:0]⁽³⁾
PTE[1:0] PTE[1:0]
MC68HC908JL8/JK8 • MC68HC08JL8/JK8 • MC68HC908KL8 Data Sheet, Rev. 3.1
162
Freescale Semiconductor