參數(shù)資料
型號(hào): PCA5007
廠商: NXP Semiconductors N.V.
英文描述: Pager baseband controller
中文描述: 傳呼機(jī)基帶控制器
文件頁數(shù): 34/112頁
文件大?。?/td> 604K
代理商: PCA5007
1998 Oct 07
34
Philips Semiconductors
Product specification
Pager baseband controller
PCA5007
6.12.4
E
NABLING OF THE
6 MH
Z OSCILLATOR
Fig.17 Relationship between 6 MHz oscillator, DC/DC converter and microcontroller.
handbook, full pagewidth
MGR120
MICROCONTROLLER
DC/DC CONVERTER
OS6CON,
ENB
I
2
C-BUS
SERIAL INTERFACE
PX
S0CON,
S0BUF
PORT I/O
EXTERNAL ACCESS
&
1
6 MHz OSCILLATOR
ENB
F6M
ENB
6.13
Real-time clock
6.13.1
F
UNCTION
The Real-Time Clock (RTC) consists of an 8-bit counter
that is active at all times. To save power it is operated
directly on V
BAT
. It counts up on every 4 Hz clock pulse
(corrected clock).
The RTC can be read from and written to by the processor.
When it reaches 239, the signal MINUTE is activated. This
signal resets the counter to 0 (at the next clock pulse), and
generates a MIN-interrupt for the processor.
The microcontroller ‘sees’ the minute interrupt as if it was
an X9 interrupt. It can be enabled and disabled and must
be cleared as an X9 interrupt (CLR IQ9).
If the DC/DC converter is not active when this happens,
the DC/DC converter is started first, and a
power-up/restart sequence of the microcontroller follows.
The MIN bit remains set during this procedure.
6.13.2
R
EAL
-T
IME
C
LOCK
C
ONTROL
R
EGISTER
(RTCON)
The RTCCON special function register is used to control
the operation of the on-chip real-time clock function.
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