參數資料
型號: 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: 132/145頁
文件大?。?/td> 673K
代理商: MC68HC705CL48
June 11, 1997
GENERAL RELEASE SPECIFICATION
MC68HC05CL48
CALLER-ID
MOTOROLA
REV 2.0
11-3
Figure 11-3. RT_L Interrupt
11.4
RING DETECTOR
The ring detect circuit validates the input ring signal (RD2) and the ring detect
output is available in a read-only register (RD) in Control/Status Register 2
(CLCSR2). It can also be overwritten by writing to RDO (Ring Detect Override) in
the Control/Status Register 1(CLCSR1) when enabled by writing a ‘1’ to RDOE
(Ring Detect Override Enable) in the CLCSR3 register. A valid ring signal can also
produce an interrupt to the CPU when enabled by the RDIE bit in CLCSR1. See
Figure 11-4. Ring Detect Interface
VDD
External Pull-up
RT_L Interrupt
External Cap
0.02
F typical
270k
typical
RDI1
RT_L
Ring Detect
RDO
RDOE
RD
DB
RDIE
RDIF
Read
Interrupt
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