XE8000EV101 Semtech, XE8000EV101 Datasheet - Page 124

• Manufacturer Part Number: XE8000EV101
• Description: EVAL BOARD FOR XE8801AMI027LF
• Manufacturer: Semtech
• Type: MCUr

Specifications of XE8000EV101

• Contents: Fully Assembled Evaluation Board
• For Use With/related Products: XE88LC01AMI027
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

The CkRc clock is the RC oscillator. The clocks below 32kHz can be derived from the RC oscillator or the crystal
oscillator (see the documentation of the clock block). A separate external clock source can be delivered on Port A
for each individual counter.
The external clock sources can be debounced or not by setting the Port A configuration registers.
The clock source can be changed only when the counter is stopped.
Each counter can work in one of the following modes:
The counters A and B or C and D can be cascaded or not. In cascaded mode, A and C are the LSB counters while
B and D are the MSB counters.
Table 18-11 shows the different operation modes of the counters A and B as a function of the mode control bits.
For all counter modes, the source of the down or upcount selection is given (either the bit CntADownUp or the bit
CntBDownUp). Also, the mapping of the interrupt sources IrqA and IrqB and the PWM output on PB(0) in these
different modes is shown.
The switching between different modes must be done while the concerned counters are stopped. While switching
capture mode on and off, unwanted interrupts can appear on the interrupt channels concerned by this mode
change.
© Semtech 2005
For all counter modes, the source of the down or upcount selection is given (either the bit CntCDownUp or the bit
18.8 Counter mode selection
Table 18-12 shows the different operation modes of the counters C and D as a function of the mode control bits.
CntDDownUp). The mapping of the interrupt sources IrqC and IrqD and the PWM output on PB(1) in these
1) Counter, downcount & upcount
2) Captured counter, downcount & upcount (only counters A&B)
3) PWM, downcount
CascadeAB
0
1
0
1
0
1
0
CountPWM0
0
0
1
1
0
0
1
CapFunc(1:0)
Table 18-11: Operating modes of the counters A and B
00
00
00
00
1x
x1
1x
x1
1x
x1
or
or
or
different modes is also shown.
Counter 8b
Captured counter 16b AB
Counter A
Downup: A
Downup: A
counter 8b
Captured
PWM 8b
PWM 8b
mode
Down
Down
PWM 10 – 16b AB
Counter 16b AB
Downup: A
Downup: A
Down
18-6
Counter 8b
Counter 8b
Counter B
Downup: B
Downup: B
Downup: B
counter 8b
counter 8b
Captured
Captured
mode
Down
Must not
Counter
Counter
Capture
Capture
be used
source
IrqA
AB
AB
A
A
-
-
Counter
Counter
Capture
Capture
Capture
source
XE8801A – SX8801R
IrqB
AB
B
B
B
B
-
-
PWM AB
function
PWM A
PWM A
PB(0)
PB(0)
PB(0)
PB(0)
PB(0)
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