PCA5007 datasheet(39/112 Pages) PHILIPS

39 / 112 page

1998 Oct 07

Philips Semiconductors

Product speciﬁcation

Pager baseband controller

PCA5007

WU0 to WU15 is a 16-bit register that is loaded by the

processor. The contents of this register will be loaded into

a 16-bit reload latch with a positive pulse on SET and into

the 16-bit ripple-down counter with a positive pulse on

LOAD.

The value stored in the wake-up counter cannot be read by

software. The contents of this counter are only initialized

when RESETIN is activated. During an off sequence, the

wake-up counter continues its operation.

The wake-up interrupt can only occur while the STB flag in

the DCCON0 SFR is HIGH, i.e. the DC/DC converter is

able to sustain the VDD supply voltage. If the STB flag is at

logic 0 the wake-up counter continues its operation, the

WUP flag is set when expired (but can still be checked by

software) but an interrupt is not generated.

6.14.4

EXAMPLE SEQUENCE FOR CONTROLLING THE

WAKE

-UP COUNTER

Sequence to set another reload value:

MOV WUC1, #(high VALUE)

MOV WUC0, #(low VALUE)

MOV WUCON, #82H; set RUN and LOAD bit

MOV WUCON, #83H; activate SET flag

MOV PCON, #01H; >>> IDLE, WAIT FOR CPL

INTERRUPT.

6.14.5

TIMING

Fig.20 Operation of wake-up counter to microcontroller interface.

handbook, full pagewidth

MGR123

SET bit in SFR

internal SET flag

internal STORE

internal data

counter value

LOAD

data in SFR

9600 Hz

CPL bit in WUCON

(generates interrupt

if enabled)

transfer to 1 V registers completed, data may change again

cleared by software

set by hardware

− 1

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