20-668-0011 Rabbit Semiconductor, 20-668-0011 Datasheet - Page 121
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
Available stocks
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Manufacturer
Quantity
Price
Company:
Part Number:
20-668-0011
Manufacturer:
Rabbit Semiconductor
Quantity:
10 000
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15.2.4 Interrupts
A Timer A interrupt can be generated whenever Timers A1–A7 decrement to zero by
enabling the appropriate bit in TACSR. The interrupt request is cleared when TACSR is
read.
The Timer A interrupt vector is in the IIR at offset 0x0A0. It can be set as Priority 1, 2, or
3 in TACR.
15.3 Operation
The following steps explain how to set up a Timer A timer.
1. Select perclk as the Timer A input clock in TAPR (default is perclk/2).
2. Select the source clocks for Timers A2–A7 in TACR.
3. Write the desired divider value to TATxR for all timers that will be used.
4. Enable Timer A by writing a 1 to bit 0 of TACSR.
15.3.1 Handling Interrupts
The following steps explain how an interrupt is set up and used. Remember to set up the
interrrupt vector before you enable the interrupts.
1. Write the vector of the interrupt service routine to the internal interrupt table.
2. Configure TACSR to select which timers will generate an interrupt.
3. Configure TACR to select the interrupt priority (note that interrupts will be enabled
The interrupt request is cleared by reading from TACSR.
15.3.2 Example ISR
A sample interrupt handler is shown below.
Chapter 15 Timer A
once this value is set). This should be done last.
timerA_isr::
push af
ioi ld a, (TACSR)
; handle all interrupts flagged in TACSR here
pop af
ipres
ret
; save used registers
; clear the interrupt request and get status
; restore registers
111
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