668-0011 Rabbit Semiconductor, 668-0011 Datasheet - Page 127

• Manufacturer Part Number: 668-0011
• Description: IC MPU RABIT3000A 55.5MHZ128LQFP
• Manufacturer: Rabbit Semiconductor

Specifications of 668-0011

• Rohs Status: RoHS non-compliant
• 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
• Features: -
• Other names: 316-1043

16.3 Operation
The following steps explain how to set up a Timer B countdown timer.
1. Select perclk/2, perclk/16, or countdown Timer A1 in TBCR.
2. Enable Timer B by writing a 1 to bit 0 of TBCSR.
16.3.1 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 TBCSR to select which match registers will generate an interrupt.
3. Configure TBCR to select the interrupt priority (note that interrupts will be enabled
The interrupt request is cleared by reading from TBCSR.
16.3.2 Example ISR
A sample interrupt handler is shown below.
Chapter 16 Timer B
once this value is set; this step should be done last).
timerB_isr::
push af
ioi ld a, (TBCSR)
; handle all interrupts flagged in TBCSR here
; reload match register(s) if necessary
pop af
ipres
ret
; save used registers
; clear the interrupt request and get status
; restore used registers
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