ucb1200 NXP Semiconductors, ucb1200 Datasheet - Page 30

• Manufacturer Part Number: ucb1200
• Description: Advanced Modem/audio Analog Front-end
• Manufacturer: NXP Semiconductors

Philips Semiconductors
INTERRUPT CIRCUIT
The UCB1200 contains a programmable interrupt control block, which can generate an interrupt for a '0' to '1' and/or a
'1' to '0' transition on one or more of the IO0-IO9 pins, the audio and telecom clip detect, the adc_ready signal and the
TSPX and TSMX signals.
The interrupt generation mode is set by IO_RIS_INT[n] in register 2 and INT_FAL_ENA[n] in control register 3. The actual
interrupt status of each signal can be read from the control register 4. The interrupt status is cleared whenever a ‘0’ to ‘1’
transition is written in control register 4 for the corresponding bit.
The IRQOUT pin presents the 'OR' function of all interrupt status bits and can be used to give an interrupt to the system
controller.
The interrupt controller is implemented asynchronously. This provides the possibility to generate interrupts when the
SIBCLK is stopped, e.g. an interrupt can be generated in power down mode, when the touch screen is pressed or when
the state of one of the IO pins changes.
1998 Jul 22
Advanced modem/audio analog front-end
interrupt
source
reset
‘1’
D
D
interrupt clear
register 4 (write)
Fig.25 Block diagram of the interrupt controller.
R
R
Q
Q
falling edge
interrupt enable
register 3
rising edge
interrupt enable
register 2
&
&
30
interrupt status
register 4 (read)
‘OR’ tree
Product specification
IRQOUT
UCB1200