Datasheet

dsPIC33FJ32GP202/204 and dsPIC33FJ16GP304
DS70290J-page 226 © 2007-2011 Microchip Technology Inc.
FIGURE 22-5: TIMER1, 2 AND 3 EXTERNAL CLOCK TIMING CHARACTERISTICS
TABLE 22-22: 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 ≤ T
A ≤ +125°C for Extended
Param
No.
Symbol Characteristic
(2)
Min Typ Max Units Conditions
TA10 TTXH TxCK High Time Synchronous,
no prescaler
0.5 TCY + 20 — — ns Must also meet
parameter TA15
Synchronous,
with prescaler
10 — — ns
Asynchronous 10 — — ns
TA11 T
TXL TxCK Low Time Synchronous,
no prescaler
0.5 TCY + 20 — — ns Must also meet
parameter TA15
Synchronous,
with prescaler
10 — — ns
Asynchronous 10 — — ns
TA15 T
TXP TxCK Input Period Synchronous,
no prescaler
TCY + 40 — — ns —
Synchronous,
with prescaler
Greater of:
20 ns or
(T
CY + 40)/N
— — — N = prescale
value
(1, 8, 64, 256)
Asynchronous 20 — — ns —
OS60 Ft1 SOSC1/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
0.5 TCY —1.5 TCY ——
Note 1: Timer1 is a Type A.
2: These parameters are characterized by similarity, but are not tested in manufacturing.
Note: Refer to Figure 22-1 for load conditions.
Tx11
Tx15
Tx10
Tx20
TMRx
OS60
TxCK