Mikroelektronika MikroE Development Kits MIKROE-1209 Data Sheet

© 2009-2012 Microchip Technology Inc.

DS70616F-page 323

bit 6-4

INTDIV<2:0>: Timer Input Clock Prescale Select bits (interval timer, main timer (position counter),
velocity counter and index counter internal clock divider select)

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

bit 3

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

bit 2

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

bit 1-0

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: When CCM = 10 or CCM = 11, all of the QEI counters operate as timers and the PIMOD<2:0> bits are 

ignored.

2: When CCM = 00 and QEA and QEB values match Index Match Value (IMV), the POSCNTH and 

POSCNTL registers are reset.

3: The selected clock rate should be at least twice the expected maximum quadrature count rate.