Datasheet

© 2011-2012 Microchip Technology Inc. Preliminary DS39997C-page 273
PIC24FJ16MC101/102 AND PIC24FJ32MC101/102/104
FIGURE 26-5: TIMER1, 2 AND 3 EXTERNAL CLOCK TIMING CHARACTERISTICS
Note: Refer to Figure 26-1 for load conditions.
Tx11
Tx15
Tx10
Tx20
TMRx
OS60
TxCK
TABLE 26-22: 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
(2)
Min Typ Max Units Conditions
TA10 TTXH TxCK High
Time
Synchronous
mode
Greater of:
20 or
(T
CY + 20)/N
——ns
Must also meet
parameter TA15
N = prescaler
value (1, 8, 64,
256)
Asynchronous 35 — — ns
TA11 T
TXLTxCK Low
Time
Synchronous
mode
Greater of:
20 ns or
(T
CY + 20)/N
— — ns Must also meet
parameter TA15
N = prescaler
value (1, 8, 64,
256)
Asynchronous 10 — — ns
TA15 T
TXP TxCK Input
Period
Synchronous
mode
Greater of:
40 or
(2 T
CY + 40)/N
— — ns N = prescale
value
(1, 8, 64, 256)
OS60 Ft1 SOSC1/T1CK Oscillator
Input frequency Range
(oscillator enabled by
setting bit TCS
(T1CON<1>))
DC — 50 kHz —
TA20 TCKEXTMRL Delay from External TxCK
Clock Edge to Timer
Increment
0.75 TCY + 40 — 1.75 TCY + 40 ns —
Note 1: Timer1 is a Type A.
2: These parameters are characterized by similarity, but are not tested in manufacturing.