Propeller Manual

CTRA, CTRB – Spin Language Reference
Page 98 · Propeller Manual v1.1
Table 2-7: Counter Modes (CTRMODE Field Values)
CTRMODE Description
Accumulate
FRQx to PHSx
APIN
Output*
BPIN
Output*
%00000 Counter disabled (off) 0 (never) 0 (none) 0 (none)
%00001
%00010
%00011
PLL internal (video mode)
PLL single-ended
PLL differential
1 (always)
1
1
0
PLLx
PLLx
0
0
!PLLx
%00100
%00101
NCO single-ended
NCO differential
1
1
PHSx[31]
PHSx[31]
0
!PHSx[31]
%00110
%00111
DUTY single-ended
DUTY differential
1
1
PHSx-Carry
PHSx-Carry
0
!PHSx-Carry
%01000
%01001
%01010
%01011
POS detector
POS detector with feedback
POSEDGE detector
POSEDGE detector w/ feedback
A
1
A
1
A
1
& !A
2
A
1
& !A
2
0
0
0
0
0
!A
1
0
!A
1
%01100
%01101
%01110
%01111
NEG detector
NEG detector with feedback
NEGEDGE detector
NEGEDGE detector w/ feedback
!A
1
!A
1
!A
1
& A
2
!A
1
& A
2
0
0
0
0
0
!A
1
0
!A
1
%10000
%10001
%10010
%10011
%10100
%10101
%10110
%10111
%11000
%11001
%11010
%11011
%11100
%11101
%11110
%11111
LOGIC never
LOGIC !A & !B
LOGIC A & !B
LOGIC !B
LOGIC !A & B
LOGIC !A
LOGIC A <> B
LOGIC !A | !B
LOGIC A & B
LOGIC A == B
LOGIC A
LOGIC A | !B
LOGIC B
LOGIC !A | B
LOGIC A | B
LOGIC always
0
!A
1
& !B
1
A
1
& !B
1
!B
1
!A
1
& B
1
!A
1
A
1
<> B
1
!A
1
| !B
1
A
1
& B
1
A
1
== B
1
A
1
A
1
| !B
1
B
1
!A
1
| B
1
A
1
| B
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
*Must set corresponding DIR bit to affect pin
A
1
= APIN input delayed by 1 clock
A
2
= APIN input delayed by 2 clocks
B
1
= BPIN input delayed by 1 clock