20-101-0356 Rabbit Semiconductor, 20-101-0356 Datasheet - Page 56

• Manufacturer Part Number: 20-101-0356
• Description: COMPUTER SINGLE-BOARD BL1800
• Manufacturer: Rabbit Semiconductor

Specifications of 20-101-0356

• Module/board Type: Single Board Computer Module
• Product: Modules
• Data Bus Width: 8 bit
• Processor Type: Rabbit 2000
• Sram: 128 KB
• Flash: 256 KB
• Timers: 8 bit, 10 bit
• Number Of I/os: 14
• Backup Battery: 3 V Lithium Coin Type
• Operating Voltage: 8 V to 40 V
• Power Consumption: 1.2 W
• Board Size: 89 mm x 64 mm x 19 mm
• Description/function: Computer Module
• For Use With/related Products: BL1800
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 316-1079

4.4.1.3 Analog Output
The two analog output channels on the Jackrabbit (DA0 and DA1 on header J5) are con-
trolled by a pulse-width modulation (PWM) driver. This requires the use of some fraction
of the CPU cycles when the driver is running (up to 20% when both D/A channels are
used). A voltage is selected by giving a value from 0 to 1024 to the driver, corresponding
roughly to 0.1 V to 3.5 V on DA0. Because of the PWM interrupt frequency, the PWM
driver can provide a continuous range of voltage output in the range from 0.1 V to 3.0 V
for DA0, and 0.6 V to 3.6 V for DA1. These ranges can be specified with the constants
PWM_MIN
PWM_MIN
ting DA1 to
ues below
for DA1) will be rounded up to 1024.
The output channels can also be set in an “always on” or “always off” mode, which does
not require CPU cycles. The “always on” mode is set by requesting an output value of
1024, and will provide about 3.4 V on channel DA0, and 3.6 V on DA1. The “always off”
mode is selected by asking for a value of 0, and provides an output of around 0.1 V on
DA0 and 0.0 V on DA1.
See Table 5 for a summary of the possible analog output voltages corresponding to values
given in the
52
void digOut(int channel, int value);
void digOn(int channel);
void digOff(int channel);
sets the state of a digital output bit.
sets the state of a digital output bit to on (1).
sets the state of a digital output bit to off (0).
jrioInit
channel
value
jrioInit
channel
jrioInit
channel
NOTE: See the sample program JRIOTEST.C for an example of using the digital out-
,
put functions.
will output 0.1 V, and setting it to
PWM_MIN
PWM_MAX0
is the output value (0 or 1).
anaOut
PWM_MIN
is the output channel number (0-3 on the Jackrabbit).
is the output channel number (0–3 on the Jackrabbit).
is the output channel number (0–3 on the Jackrabbit).
must be called first.
must be called first.
must be called first.
will be rounded down to 0, and values above
function.
, and
will output 0.6 V, and setting it to
PWM_MAX1
. In other words, setting channel DA0 to the value
PWM_MAX0
will output 3.0 V. Similarly, set-
PWM_MAX1
PWM_MAX0
will output 3.6 V. Val-
Jackrabbit (BL1800)
(
PWM_MAX1