PCA5007 datasheet(53/112 Pages) PHILIPS

53 / 112 page

1998 Oct 07

Philips Semiconductors

Product speciﬁcation

Pager baseband controller

PCA5007

6.19.6

PORT 1 INTERRUPTS:PORT 1.0 TO PORT 1.4

(INT2 TO INT6)

Four Port 1 lines can be used as external interrupt inputs

(see Fig.25). When enabled (IEN1 SFR), each of these

lines can wake-up the device from power-down. Using the

IX1 register, each of these port lines may be set active to

either HIGH or LOW. IRQ1 is the interrupt request flag

interrupt request, but must be cleared by software, i.e. via

the interrupt software. The Port 1 interrupt request flags

can only be set if the corresponding interrupt enable bit is

set.

6.19.7

MORE INTERRUPTS:SYMCLK, DC/DC

CONVERTER

, WATCHDOG AND MINUTE

The decoder blocks generate events that can force an

interrupt when enabled (IEN0 and IEN1 SFR). These

interrupts are mapped to the corresponding P1 interrupt

request flag register bits (see Fig.26). Each flag, if the

interrupt is enabled, will send an interrupt request and

must be cleared by software, i.e. via the interrupt service

routine.

The IRQ bits are not set if the corresponding enable is not

set.

IRQ1.3: (symbol interrupt); this interrupt request flag, if

enabled, is set if the demodulator (clock recovery) has

data ready, that should be read by the microcontroller.

The event is called symbol clock or SymClk, because in

one mode of operation one symbol is delivered per

interrupt. The flag is set by hardware and needs to be

cleared by software.

IRQ1.5: (DC/DC converter interrupt); this interrupt

request flag, if enabled, is set if the DC/DC converter is

not able to deliver the required current (STB flag

cleared). The flag is set by hardware and needs to be

cleared by software.

IRQ1.6: (watchdog interrupt); this interrupt request flag,

if enabled, is set if the watchdog timer will expire within

⁄16 s. The flag is set by hardware and needs to be

cleared by software.

IRQ1.7: (minute interrupt); this interrupt request flag, if

enabled, is set once each minute by the real-time clock.

The flag is set by hardware and needs to be cleared by

software.

Fig.25 Interrupt Port 1.0.

handbook, full pagewidth

MGR128

IX1.0

INT2

IEN1.0

IRQ1.0

wake-up.0

Pad Port 1.0

Fig.26 SymClk (as an example for any of the 4 mentioned interrupts).

handbook, full pagewidth

MGR129

IEN1.3

SymClk

CLOCK

RECOVERY

BLOCK

IRQ1.3

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