MC68HC812A4 Datasheet, PDF (201/342 Pages) Motorola, Inc – 16-bit device composed of standard on-chip peripheral modules connected by an intermodule bus. Modules include

Standard Timer Module
Registers and Reset Initialization
PAIF — Pulse Accumulator Input Flag
PAIF is set when the selected edge is detected at the PAI pin. In event
counter mode, the event edge sets PAIF. In gated time accumulation
mode, the trailing edge of the gate signal at the PAI pin sets PAIF.
Clear PAIF by writing to the pulse accumulator flag register with PAIF
set.
1 = Active PAI input
0 = No active PAI input
NOTE:
When the fast flag clear-all enable bit, TFFCA, is set, any access to the
pulse accumulator counter registers clears all the flags in the PAFLG
register.
12.6.16 Pulse Accumulator Counter Registers
Address: $00A2
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9
Bit 8
Write:
Reset: 0
0
0
0
0
0
0
0
Address: $00A3
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Write:
Reset: 0
0
0
0
0
0
0
0
Figure 12-23. Pulse Accumulator Counter
Registers (PACNTH/L)
Read: Anytime
Write: Anytime
These registers contain the number of active input edges on the PAI pin
since the last reset.
Advance Information
MOTOROLA
Standard Timer Module
MC68HC812A4 — Rev. 3.0
201