XC68HC705F32 Motorola, XC68HC705F32 Datasheet - Page 48

• Manufacturer Part Number: XC68HC705F32
• Description: MICROCONTROLLER
• Manufacturer: Motorola

4
KIE — keyboard interrupt enable
An interrupt can only be generated if KIE and KF are both set and the I-bit in the CCR is clear.
EDG5–EDG0 — trigger edge control
The trigger edges of the interrupt lines PA5–PA0 are programmable with the EDG5–EDG0 bits in
the key control register.
4.3
This port is a standard M68HC05 bidirectional I/O port, comprising a data register and a data
direction register.
Reset does not affect the state of the data register, but clears the data direction register, thereby
returning all port pins to input mode. Writing a ‘1’ to any DDR bit sets the corresponding port pin
to output mode. The port B lines have internal pull-up resistors.
MOTOROLA
4-4
1 (set)
0 (clear) –
1 (set)
0 (clear) –
Data direction
Latched data
Port B
register bit
register bit
–
–
Keyboard interrupt enabled.
Keyboard interrupt disabled.
Sets the corresponding interrupt line to rising-edge sensitive.
Sets the corresponding interrupt line falling-edge sensitive.
buffer
Figure 4-2 Standard I/O port structure
data
O/P
PARALLEL INPUT/OUTPUT PORTS
DDRn
DATA
buffer
Input
Output
buffer
I/O
pin
Output
Input
DDRn
1
1
0
0
DATA
MC68HC05F32
0
1
0
1
tristate
tristate
I/O
0
1
TPG