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LC72358N 数据表(PDF) 8 Page - Sanyo Semicon Device |
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LC72358N 数据表(HTML) 8 Page - Sanyo Semicon Device |
8 / 13 page Continued from preceding page. No. 5065-8/13 LC72358N, 72362N, 72366 Continued on next page. Pin No. Symbol I/O I/O type Function 70 69 68 HCTR LCTR SNS I I I Input Input Input Universal counter/general-purpose input shared-function input port The IOS instruction b3 with PWn = 3 switches the pin function between universal counter input and general-purpose input. • Frequency measurement The universal counter function is selected by an IOS instruction with PWn = 3 and b3 = 0. HCTR frequency measurement mode is set up by a UCS instruction with b3 = 0 and b2 = 0, and counting is started with a UCC instruction after the count time is selected. The CNTEND flag is set when the count completes. To operate this circuit as an AC amplifier in this mode, the input must be capacitor coupled. • General-purpose input pin use The general-purpose input port function is selected by an IOS instruction with PWn = 3 and b3 = 1. An internal register (address: 0EH) input instruction INR (b0) is used to acquire data from this pin. Input is disabled in clock stop mode. (The input pin will be pulled down.) During the power-on reset, the universal counter function is selected. Universal counter (frequency and period measurement)/general-purpose input shared- function input port The IOS instruction b2 with PWn = 3 switches the pin function between universal counter input and general-purpose input. • Frequency measurement The universal counter function is selected by an IOS instruction with PWn = 3 and b2 = 0. LCTR frequency measurement mode is set up by a UCS instruction with b3 = 0 b2 = 1, and counting is started with a UCC instruction after the count time is selected. The CNTEND flag is set when the count completes. To operate this circuit as an AC amplifier in this mode, the input must be capacitor coupled. • Period measurement With the universal counter function selected, set up period measurement mode with a UCS instruction with b3 = 1 and b2 = 0, and start the count with a UCC instruction after selecting the count time. The CNTEND flag will be set when the count completes. In this mode, the signal must be input with DC coupling to turn off the bias feedback resistor. • General-purpose input pin use The general-purpose input port function is selected by an IOS instruction with PWn = 3, b2 = 1. An internal register (address: 0EH) input instruction INR (b1) is used to acquire data from this pin. Input is disabled in clock stop mode. (The input pin will be pulled down.) During the power-on reset, the universal counter function (in HCTR frequency measurement mode) is selected. Voltage sense/general-purpose input pin shared-function port This circuit is designed for a relatively low input threshold voltage. • Voltage sense pin usage This input pin is used to determine whether or not a power failure occurred after recovery from backup (clock stop) mode. An internal sense F/F is used for this determination. The sense F/F is tested with a TUL instruction (b2). • General-purpose input port usage When used as a general-purpose input port, the state is sensed by using a TUL instruction (b3). Since, unlike other input ports, input is not disabled in clock stop mode and during the power-on reset, special care is required with respect to through currents. |
类似零件编号 - LC72358N |
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类似说明 - LC72358N |
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