PIC24EP256GU810-I Datasheet, PDF (325/622 Pages) Electronic Film Capacitors, Inc. – 16-Bit Microcontrollers and Digital Signal Controllers with High-Speed PWM, USB and Advanced Analog

dsPIC33EPXXX(GP/MC/MU)806/810/814 and PIC24EPXXX(GP/GU)810/814
REGISTER 17-1: QEIxCON: QEIx CONTROL REGISTER (CONTINUED)
bit 6-4
bit 3
bit 2
bit 1-0
INTDIV<2:0>: Timer Input Clock Prescale Select bits (interval timer, main timer (position counter),
velocity counter and index counter internal clock divider select)⁽³⁾
111 = 1:128 prescale value
110 = 1:64 prescale value
101 = 1:32 prescale value
100 = 1:16 prescale value
011 = 1:8 prescale value
010 = 1:4 prescale value
001 = 1:2 prescale value
000 = 1:1 prescale value
CNTPOL: Position and Index Counter/Timer Direction Select bit
1 = Counter direction is negative unless modified by external up/down signal
0 = Counter direction is positive unless modified by external up/down signal
GATEN: External Count Gate Enable bit
1 = External gate signal controls position counter operation
0 = External gate signal does not affect position counter/timer operation
CCM<1:0>: Counter Control Mode Selection bits
11 = Internal Timer mode with optional external count is selected
10 = External clock count with optional external count is selected
01 = External clock count with external up/down direction is selected
00 = Quadrature Encoder Interface (x4 mode) Count mode is selected
Note 1:
2:
3:
When CCM = 10 or CCM = 11, all of the QEI counters operate as timers and the PIMOD<2:0> bits are
ignored.
When CCM = 00, and QEA and QEB values match Index Match Value (IMV), the POSCNTH and
POSCNTL registers are reset.
The selected clock rate should be at least twice the expected maximum quadrature count rate.
 2009-2012 Microchip Technology Inc.
DS70616G-page 325