Datasheet

© 2007-2012 Microchip Technology Inc. DS70292G-page 355
dsPIC33FJ32GP302/304, dsPIC33FJ64GPX02/X04, AND dsPIC33FJ128GPX02/X04
FIGURE 30-5: TIMER1, 2, 3 AND 4 EXTERNAL CLOCK TIMING CHARACTERISTICS
TABLE 30-22: TIMER1 EXTERNAL CLOCK TIMING REQUIREMENTS
(1)
AC CHARACTERISTICS
Standard Operating Conditions: 3.0V to 3.6V
(unless otherwise stated)
Operating temperature -40°C ≤ TA ≤ +85°C for Industrial
-40°C ≤TA ≤+125°C for Extended
Param
No.
Symbol Characteristic Min Typ Max Units Conditions
TA10 T
TXH TxCK High Time Synchronous,
no prescaler
TCY + 20 — — ns Must also meet
parameter TA15.
N = prescale
value
(1, 8, 64, 256)
Synchronous,
with prescaler
(T
CY + 20)/N — — ns
Asynchronous 20 — — ns
TA11 T
TXL TxCK Low Time Synchronous,
no prescaler
(TCY + 20) — — ns Must also meet
parameter TA15.
N = prescale
value
(1, 8, 64, 256)
Synchronous,
with prescaler
(T
CY + 20)/N — — ns
Asynchronous 20 — — ns
TA15 T
TXP TxCK Input
Period
Synchronous,
no prescaler
2 TCY + 40 — — ns —
Synchronous,
with prescaler
Greater of:
40 ns or
(2 TCY + 40)/
N
— — — N = prescale
value
(1, 8, 64, 256)
Asynchronous 40 — — ns —
OS60 Ft1 SOSCI/T1CK Oscillator Input
frequency Range (oscillator
enabled by setting bit TCS
(T1CON<1>))
DC — 50 kHz —
TA20 T
CKEXTMRL Delay from External TxCK Clock
Edge to Timer Increment
0.75 TCY +
40
—1.75 TCY +
40
——
Note 1: Timer1 is a Type A.
Note: Refer to Figure 30-1 for load conditions.
Tx11
Tx15
Tx10
Tx20
TMRx
OS60
TxCK