Control Techniques UD70, User Manual

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UD70
Issue code: 70nu2
8-34 Features
Bit Notes
5 ~ 7 M Timer mode
Mode 0 (000): Normal mode Mode 0 (000): Normal mode
The internal clock source (4MHz or 500KHz) clocks the counter. The TI event flag is
set when the counter wraps-around.
Mode 1 (001): External mode Mode 1 (001): External mode
The counter is clocked from an external source DIGIN0 (on the the –ve edge). The TI
flag is set when the counter wraps-around.
Mode 2 (010): Capture mode Mode 2 (010): Capture mode
Capture mode. The counter is clocked by the internal clock source (4MHz or
500KHz). A 1 to 0 transition on DIGIN0 causes the current counter value to be
latched into the TIMER register, the counter is then reloaded with the RELOAD
register and the TI flag set. (Use #85.05 to read the timer value in mode 2, not
#85.03.)
Mode 3 (011): Trigger mode Mode 3 (011): Trigger mode
The internal clock source (4MHz or 500KHz) clocks the counter. However the TI
event flag is set when a 1 to 0 transition is detected on DIGIN0, NOT when the
counter wraps-around. The reload mode works in the same way as mode 0 or 1.
Mode 4 (100): Gated mode Mode 4 (100): Gated mode
The internal clock source (4MHz or 500KHz) clocks the counter; the count input is
gated by the DIGIN0 input (active low). The TI event flag is set when the counter
wraps-around.