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Instruction Set
1109
SPNU563A–March 2018
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Copyright © 2018, Texas Instruments Incorporated
High-End Timer (N2HET) Module
23.6.3.16 PCNT (Period/Pulse Count)
Syntax PCNT {
[hr_lr={HIGH | LOW}]
[brk={OFF | ON}]
[next={label | 9-bit unsigned integer}]
[reqnum={3-bit unsigned integer}
[request={NOREQ | GENREQ | QUIET}]
[irq={OFF | ON}]
type={FALL2RISE | RISE2FALL | FALL2FALL | RISE2RISE}
pin={pin number}
[control={OFF | ON}]
[prv={OFF | ON}]
[period={25-bit unsigned integer}]
[data={25-bit unsigned integer]
[hr_data= {7-bit unsigned integer}
}
Figure 23-164. PCNT Program Field (P31:P0)
31 26 25 23 22 21 13 12 9 8 7 6 5 4 0
0 Request
Number
BRK Next program address 0111 Int.
ena
Type select hr_lr Pin
select
6 3 1 9 4 1 2 1 5
Figure 23-165. PCNT Control Field (C31:C0)
31 29 28 27 26 25 24 0
Res. Request
type
Control Prv. Period Count
3 2 1 1 25
Figure 23-166. PCNT Data Field (D31:D0)
31 7 6 0
Data HR Data
25 7
Cycles One
Register modified Register A
Description This instruction detects the edges of the external signal at loop start and
measures its period or pulse duration. The counter value stored in the control
field C[24:0] and in the register A is incremented each N2HET loop. PCNT
uses the HR structure on the pin to measure an HR period/pulse count value.
hr_lr (Optional) Specifies whether the PCNT instruction captures the HR
delay into the HR data field on the selected edge condition. If hr_lr is
0 (HIGH) then PCNT captures the HR delay. if hr_lr is 1 (LOW) then
PCNT only captures at loop resolution.
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