MC68HC11E1 MOTOROLA [Motorola, Inc], MC68HC11E1 Datasheet - Page 40

• Manufacturer Part Number: MC68HC11E1
• Description: M68HC11E Series Programming Reference Guide
• Manufacturer: MOTOROLA [Motorola, Inc]

M68HC11ERG/AD
Parallel I/O Control (PIOC)
40
STAF — Strobe A Interrupt Status Flag
STAI — Strobe A Interrupt Enable Mask
CWOM — Port C Wired-OR Mode (affects all eight port C pins)
HNDS — Handshake Mode Bit
OIN — Output or Input Handshake Select
PLS — Pulsed/Interlocked Handshake Operation
EGA — Active Edge for Strobe A
INVB — Invert Strobe B
Address: $1002
Reset:
Read:
Write:
M68HC11E Series Programming Reference Guide
STAF is set when the selected edge occurs on strobe A. This bit can be
cleared by a read of PIOC with STAF set followed by a read of PORTCL
(simple strobed or full input handshake mode) or a write to PORTCL (output
handshake mode).
HNDS must be set to 1 for this bit to have meaning.
HNDS must be set to 1 for this bit to have meaning. When interlocked
handshake is selected, strobe B is active until the selected edge of strobe A
is detected.
0 = No active edge detected
1 = Selected active edge detected
0 = STAF does not request interrupt
1 = STAF requests interrupt
0 = Port C outputs are normal CMOS outputs.
1 = Port C outputs are open-drain outputs.
0 = Simple strobe mode
1 = Full input or output handshake mode
0 = Input handshake
1 = Output handshake
0 = Interlocked handshake
1 = Pulsed handshake (Strobe B pulses high for two E-clock cycles.)
0 = STRA falling edge selected
1 = STRA rising edge selected
0 = Active level is logic 0.
1 = Active level is logic 1.
U = Unaffected
STAF
Bit 7
0
STAI
6
0
CWOM
5
0
HNDS
4
0
OIN
3
0
PLS
U
2
EGA
1
1
MOTOROLA
INVB
Bit 0
1