
dsPIC30F3014/4013
DS70138G-page 188
2010 Microchip Technology Inc.
FIGURE 23-8:
TYPE A, B AND C TIMER EXTERNAL CLOCK TIMING CHARACTERISTICS
TABLE 23-22: TYPE A TIMER (TIMER1) EXTERNAL CLOCK TIMING REQUIREMENTS
AC CHARACTERISTICS
Standard Operating Conditions: 2.5V to 5.5V
(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
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
TTXL
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
TTXP
TxCK Input Period Synchronous,
no prescaler
TCY + 10
—
ns
Synchronous,
with prescaler
Greater of:
20 ns or
(TCY + 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
TCKEXTMRL Delay from External TxCK Clock
Edge to Timer Increment
0.5 TCY
—1.5 TCY
—
Note 1:
Timer1 is a Type A.
Tx11
Tx15
Tx10
Tx20
TMRX
OS60
TxCK