Datasheet

 2009-2012 Microchip Technology Inc. DS70591E-page 411
dsPIC33FJ32GS406/606/608/610 and dsPIC33FJ64GS406/606/608/610
FIGURE 27-26: TIMERQ (QEI MODULE) EXTERNAL CLOCK TIMING CHARACTERISTICS
TABLE 27-46: QEI INDEX PULSE TIMING REQUIREMENTS
AC CHARACTERISTICS
Standard Operating Conditions: 3.0V to 3.6V
(unless otherwise stated)
Operating temperature -40°C  T
A  +85°C for Industrial
-40°C  TA  +125°C for Extended
Param
No.
Symbol Characteristic
(1)
Min Max Units Conditions
TQ50 TqIL Filter Time to Recognize Low,
with Digital Filter
3 * N * TCY — ns N = 1, 2, 4, 16, 32, 64,
128 and 256 (Note 2)
TQ51 TqiH Filter Time to Recognize High,
with Digital Filter
3 * N * T
CY — ns N = 1, 2, 4, 16, 32, 64,
128 and 256 (Note 2)
TQ55 Tqidxr Index Pulse Recognized to Position
Counter Reset (ungated index)
3 TCY —ns —
Note 1: These parameters are characterized but not tested in manufacturing.
2: Alignment of index pulses to QEA and QEB is shown for position counter Reset timing only. Shown for
forward direction only (QEA leads QEB). Same timing applies for reverse direction (QEA lags QEB) but
index pulse recognition occurs on the falling edge.
TQ11
TQ15
TQ10
TQ20
QEB
POSCNT
TABLE 27-47: QEI MODULE EXTERNAL CLOCK TIMING REQUIREMENTS
AC CHARACTERISTICS
Standard Operating Conditions: 3.0V to 3.6V
(unless otherwise stated)
Operating temperature -40°C  T
A  +85°C for Industrial
-40°C  TA  +125°C for Extended
Param
No.
Symbol Characteristic
(1)
Min Typ Max Units Conditions
TQ10 TtQH TQCK High Time Synchronous,
with prescaler
TCY + 20 — — ns Must also meet
Parameter TQ15
TQ11 TtQL TQCK Low Time Synchronous,
with prescaler
TCY + 20 — — ns Must also meet
Parameter TQ15
TQ15 TtQP TQCP Input
Period
Synchronous,
with prescaler
2 * T
CY + 40 — — ns
TQ20 T
CKEXTMRL Delay from External TxCK Clock
Edge to Timer Increment
0.5 TCY — 1.5 TCY —
Note 1: These parameters are characterized but not tested in manufacturing.