mc68hc908jb8 Freescale Semiconductor, Inc, mc68hc908jb8 Datasheet - Page 206

• Manufacturer Part Number: mc68hc908jb8
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Input/Output Ports (I/O)
Technical Data
206
When bit DDRBx is a logic 1, reading address $0001 reads the PTBx
data latch. When bit DDRBx is a logic 0, reading address $0001 reads
the voltage level on the pin. The data latch can always be written,
regardless of the state of its data direction bit.
the operation of the port B pins.
NOTES:
1. X = don’t care.
2. Hi-Z = high impedance.
3. Writing affects data register, but does not affect input.
DDRB
Bit
0
1
READ DDRB ($0005)
WRITE DDRB ($0005)
WRITE PTB ($0001)
READ PTB ($0001)
PTB Bit
Input/Output Ports (I/O)
X
X
(1)
Table 12-3. Port B Pin Functions
Figure 12-7. Port B I/O Circuit
MC68HC908JB8•MC68HC08JB8•MC68HC08JT8 — Rev. 2.3
RESET
I/O Pin Mode
Input, Hi-Z
Output
(2)
DDRBx
PTBx
Read/Write
DDRB[7:0]
DDRB[7:0]
Accesses
to DDRB
Table 12-3
PTB[7:0]
Freescale Semiconductor
Read
Accesses to PTB
Pin
summarizes
PTB[7:0]
PTB[7:0]
Write
PTBx
(3)