20-668-0011 Rabbit Semiconductor, 20-668-0011 Datasheet - Page 199
20-668-0011
Manufacturer Part Number
20-668-0011
Description
IC MPU RABIT3000A 55.5MHZ128LQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0011.pdf
(312 pages)
Specifications of 20-668-0011
Processor Type
Rabbit 3000 8-Bit
Speed
55.5MHz
Voltage
2.5V, 2.7V, 3V, 3.3V
Mounting Type
Surface Mount
Package / Case
128-LQFP
Data Bus Width
8 bit
Maximum Clock Frequency
55.5 MHz
Operating Supply Voltage
1.8 V to 3.6 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 55 C
Number Of Programmable I/os
56
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
316-1061
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Part Number:
20-668-0011
Manufacturer:
Rabbit Semiconductor
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22.3 Operation
The following steps explain how to set up a PWM channel.
1. Configure Timer A9 via TAT9R to provide the desired PWM clock frequency.
2. Configure PWLxR to select whether to spread the PWM output throughout the cycle.
3. Configure PWLxR to select whether to suppress the PWM output.
4. Configure the duty cycle by writing to PWLxR and PWMxR.
22.3.1 Handling Interrupts
The following steps explain how an interrupt is set up and used.
1. Write the vector to the interrupt service routine to the internal interrupt table.
2. Configure PWL0R to select the PWM interrupt priority and PWL1R to select PWM
The following actions occur within the interrupt service routine.
• Any PWM values may be updated.
• The interrupt request should be cleared by writing to any PWM register.
22.3.2 Example ISR
A sample interrupt handler is shown below.
Chapter 22 Pulse Width Modulator
interrupt suppression (if an interrupt is desired).
pwm_isr::
push af
ld a, 0x55
ioi ld (PWM0R), a
; note that interrupt request is also cleared by register write above
pop af
ipres
ret
; save used registers
; restore used registers
; update a PWM value
189
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