參數(shù)資料
型號(hào): MC68HC705CL48
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 1.802 MHz, MICROCONTROLLER, PQFP112
封裝: TQFP-112
文件頁數(shù): 131/145頁
文件大?。?/td> 673K
代理商: MC68HC705CL48
GENERAL RELEASE SPECIFICATION
June 11, 1997
MOTOROLA
CALLER-ID
MC68HC05CL48
11-2
REV 2.0
11.1
FSK DEMODULATOR
The recovered signal consists of both the channel seizure information and the
message words. The original serial raw data is made available via the MCU
registers. See Section 11.7.2.
11.2
CARRIER DETECTOR
The Carrier Detect block will validate the carrier signal from the lter section. The
asynchronous carrier signal is considered valid if present for a minimum of 25ms.
A carrier dropout is conrmed if it is silent for more than 8ms. The carrier detect
signal will remain low until a dropout condition is detected. The carrier detect
output is available in a read-only register (CD) in Control/Status Register 2
(CLCSR2). It can also be overwritten by writing to CDO (Carrier Detect Override)
in the Control/Status Register 1 (CLCSR1) when enabled by writing a ‘1’ to CDOE
(Carrier Detect Override Enable) in the CLCSR3 register. A valid carrier can also
produce an interrupt to the CPU when enabled by the CDIE bit in CLCSR1. See
Figure 11-2. Carrier Detect Interface
11.3
RT_L INTERRUPT
Figure 11-3 shows that the RT_L pin connected to a ring time circuit. When RDI1
is ‘low’, RT_L is pulled high by the external pull-up resistor. When RDI1 rises
above 1.0 volt, RT_L will be pulled low by the open-drain NMOS transistor and an
interrupt will be generated.
Note: RT_L interrupt is permanently disabled in the current design and can only
be enabled by a Metal Mask Option.
Carrier Detect
CDO
CDOE
CD
DB
CDIE
CDIF
Read
Interrupt
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