參數(shù)資料
型號: PCA5007
廠商: NXP Semiconductors N.V.
英文描述: Pager baseband controller
中文描述: 傳呼機基帶控制器
文件頁數(shù): 39/112頁
文件大?。?/td> 604K
代理商: PCA5007
1998 Oct 07
39
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 V
DD
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
E
XAMPLE 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
T
IMING
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
CPL bit in WUCON
(generates interrupt
if enabled)
transfer to 1 V registers completed, data may change again
cleared by software
set by hardware
m
m
i
i
1
m
m
1
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