122-32000 Parallax Inc, 122-32000 Datasheet - Page 205

• Manufacturer Part Number: 122-32000
• Description: MANUAL PROPELLER
• Manufacturer: Parallax Inc

Specifications of 122-32000

• Accessory Type: Manual
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: Propeller Education (PE) Kit
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

CTRA, CTRB
4: Spin Language Reference –
state machine. Since the counter’s update period may be brief (12.5 ns at 80 MHz), very
dynamic signal generation and measurement is possible.
Control Register Fields
The
and
registers each contain four fields shown in the table below.
CTRA
CTRB
Table 4-5: CTRA and CTRB Registers
31
30..26
25..23
22..15
14..9
8..6
5..0
-
CTRMODE
PLLDIV
-
BPIN
-
APIN
APIN
The APIN field of
selects a primary I/O pin for that counter. May be ignored if not
CTRA
used. %0xxxxx = Port A, %1xxxxx = Port B (reserved for future use).
In Propeller
Assembly, the APIN field can conveniently be written using the
instruction.
MOVS
Note that writing a zero to
will immediately disable the Counter A and stop all related
CTRA
pin output and
accumulation.
PHSA
BPIN
The BPIN field of
x selects a secondary I/O pin for that counter. This field may be
CTR
ignored if not used. %0xxxxx = Port A, %1xxxxx = Port B (reserved for future use). In
Propeller Assembly, the BPIN field can conveniently be written using the
instruction.
MOVD
PLLDIV
The PLLDIV field of
x selects a PLLx output tap, see table below. This determines which
CTR
power-of-two division of the VCO frequency will be used as the final PLLx output (a range
of 500 KHz to 128 MHz). This field may be ignored if not used. In Propeller Assembly, the
PLLDIV field can conveniently be written, along with CTRMODE, using the
MOVI
instruction.
Table 4-6: PLLDIV Field
PLLDIV
%000
%001
%010
%011
%100
%101
%110
%111
Output
VCO ÷ 128 VCO ÷ 64
VCO ÷ 32
VCO ÷ 16
VCO ÷ 8
VCO ÷ 4
VCO ÷ 2
VCO ÷ 1
Propeller Manual v1.0 · Page 205