Rainbow Electronics AT75C220 - Manual (Page 111)

AT75C220
111
• ETRGEDG: External Trigger Edge Selection
• ABETRG: TIOA or TIOB External Trigger Selection
0 = TIOB is used as an external trigger.
1 = TIOA is used as an external trigger.
• CPCTRG: RC Compare Trigger Enable
0 = RC Compare has no effect on the counter and its clock.
1 = RC Compare resets the counter and starts the counter clock.
• WAVE
0 = Capture mode is enabled.
1 = Capture mode is disabled (waveform mode is enabled).
• LDRA: RA Loading Selection
• LDRB: RB Loading Selection
ETRGEDG Edge
0 0 None
0 1 Rising edge
1 0 Falling edge
1 1 Each edge
LDRA Edge
0 0 None
0 1 Rising edge of TIOA
1 0 Falling edge of TIOA
1 1 Each edge of TIOA
LDRB Edge
0 0 None
0 1 Rising edge of TIOA
1 0 Falling edge of TIOA
1 1 Each edge of TIOA