參數(shù)資料
型號(hào)： FM8P51EP
廠商： Electronic Theatre Controls, Inc.
英文描述： EPROM/ROM-Based 8-Bit Microcontroller
中文描述： 存儲(chǔ)器/基于ROM的8位微控制器
文件頁(yè)數(shù)： 35/60頁(yè)
文件大?。?/td> 369K
代理商： FM8P51EP
FM8P51
Rev1.2 Mar 15, 2005
P.35/FM8P51
FEELING
TECHNOLOGY
2.9 Resistor to Frequency Converter (RFC)
The Resistor to Frequency Converter (RFC) can compare nineteen different sensors with the reference resistor
separately.
This RFC contains nighteen external pins:
CX : the oscillation schemmit trigger input (IOA1/CX pin).
RFC0 ~ RFC18: the resistor/sensor output pin 0 ~ 18 (IOA2/RFC0, IOA3/RFC1, IOA4/RFC2, IOA5/RFC3,
IOA6/RFC4, IOA7/RFC5, IOD0/RFC6, IOD1/RFC7, IOB1/RFC8, IOB2/RFC9, IOB3/RFC10,
IOB4/RFC11, IOB5/RFC12, IOB6/RFC13, IOB7/RFC14, IOC2/RFC15, IOC1/RFC16,
DATA/RFC17, and CLK/RFC18 pins)
FIGURE 2.13: The Block Diagram of RFC
TABLE 2.5: The Description of RFC Control Bits
Select one the RFC oscillation network of RFCx (x = 0 to 18). The selected IOxx/RFCx
pin will be configured as RFCx output pin if RFCON = 1. Other IOxx/RFCx pins will still
behave as port pins. If RFCON = 0, all IOxx/RFCx pins will still behave as port pins.
= 1, RFC counter start to convert. Reset by hardware after conversion is finished.
= 0, Stop the RFC conversion
= 1, Enable RFC module, the selected IOXX/RFCx pin is configured to RFCx pin, an the
IOA1/CX pin is configured to CX pin.
= 0, Disable RFC module, all the IOxx/RFCx pins are configured to IOxx pin, and the
IOA1/CX pin is configured to IOA1 pin.
2.9.1 RC Oscillator Network
The RFC circuitry may build up 19 RC oscillation networks through RFC0 to RFC18 and CX pins with external
resistors. Only one RC oscillation network may be active at a time. When the oscillation network is built up, the count
active pulse will be generated by the oscillation network and transferred to the 15-bit counter through the CX pin. It
will then enable or disable the 15-bit counter in order to count the oscillation clock.
The 15-bit RFC counter is
cleared when a value is written to RFCCON register, RFCON bit is cleared, and during any kind of reset as
well.
How to built the RC oscillation network:
1. Connect the resistor and capacitor on RFCx (x = 0 to 18, if needed) and CX pins.
2. Switch all of the needed RFCx and CX pins to input mode.
RFCS4:RFCS0
START
RFCON
R
RFCx
RFCx
R
RFC1
RFC1
R
RFC0
RFC0
CX
C
CX
RFCS4:0 = 0
RFCS4:0 = 1
RFCS4:0 = x
15-bit counter
CLKIN
Counter active signal
(Controlled by CX pin signal)
Set RFCIF Flag
when count finished
Fosc
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PDF描述
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