XC68HC705F32 Motorola, XC68HC705F32 Datasheet - Page 47

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

4.2.1.1
This register contains eight bits, two of which are used to control the keyboard interrupt facility, the
others determine the keyboard interrupt edges.
KF — Keyboard interrupt status flag
This bit is set when a valid transition is detected on any of the port A pins; a keyboard interrupt
request will be generated, if keyboard interrupts are enabled (only if KIE is set). The KF flag is
cleared by resetting the IRSTATE register, or by setting KEYCLR = 1 in the system option register.
MC68HC05F32
Key control register (KCR)
1 (set)
0 (clear) –
Bit 6, $1B
Bit 0, $1B
Bit 0, $04
EDG0
DDR0
KIE
Key control register (KCR)
–
A valid transition has occurred on one of the port pins.
No valid transition has occurred on any of the port pins.
Figure 4-1 Structure of port with keyboard interrupt
Internal data bit 0
Address
PARALLEL INPUT/OUTPUT PORTS
$001B
VDD
bit 7
KF
KIE
bit 6
D
C
KEYMUX and
read PTAIO
Interrupt
state 0
EDG5 EDG4 EDG3 EDG2 EDG1 EDG0 0000 0000
R
bit 5
Q
IRST1 – IRST8
bit 4
bit 3
8
bit 2
bit 1
bit 0
MOTOROLA
KF and
keyboard
interrupt
request
on reset
State
TPG
4-3
4