ADLINK USB-1210 - Manual (Page 42)

32 Operation & Calibration
X Programmable gate selection (hardware or software con-
trol)
X
Programmable input and output signal polarities (high active
or low active)
X
Initial Count loaded from a software application
X Current count value readable by software without affecting
circuit operation.
*Not used in GPTC
Table 3-3: Timer/Counter Pin Definition
3.1.6 Basic Timer/Counter Function
Each timer/counter has three inputs that can be controlled via
hardware or software. They are clock input (GPTC_CLK), gate
input (GPTC_GATE), and up/down control input (GPTC_UD). The
GPTC_CLK input provides a clock source input to the timer/coun-
ter. Active edges on the GPTC_CLK input increment or decrement
the counter. The GPTC_UD input directs the counter to count up
or down (high: count up; low: count down), while the GPTC_GATE
input is a control signal acting as a counter enable or counter trig-
ger signal in different applications. The GPTC_OUT then gener-
ates a pulse signal based on the timer/counter mode set.
Pin Pin
IGND 20 40 IGND
GPTC_CLK 19 39 GPTC_OUT0
GPTC_UD0 18 38 GPTC_OUT1
GPTC_GATE0 17 37 GPTC_OUT2
GPTC_AUX0 16 36 GPTC_OUT3
GPTC_CLK2 15 35 IGND
GPTC_UD2 14 34 N/C*
GPTC_GATE2 13 33 N/C*
GPTC_AUX2 12 32 N/C*
IGND 11 31 N/C*