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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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DOC7707 데이터시트(PDF) 220 Page - List of Unclassifed Manufacturers |
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DOC7707 데이터시트(HTML) 220 Page - List of Unclassifed Manufacturers |
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220 / 307 page  220 7707F–AVR–11/10 AT90USB82/162 21. PS/2 21.1 Characteristics The PS/2 pad IO’s characteristics are: – support 5.5V (min: 4.5V, max: 5.5V) – open drain type – Output voltage level threshold, MCU driving low thru a 1k Ω pull-up: VOLmax = 0,7V – fall time with 1k Ω pull-up and 500pF load: 250ns < Tfall < 1µs – internal 2.2k Ω to 10kΩ pull-up at Vcc (5V), controlled by firmware. – High impedance output when disabled. Figure 21-1. USB pad and PS/2 pad multiplexing • Bit 7:1 – Reserved bits Do not set these bits. • Bit 0 – PS2EN : PS/2 Pad Enable Set this bit to “1” to enable the PS/2 pad. Set this bit to “0” to disable the PS/2 pad. For more information about pad driving, see “USB/PS2 Software Output Enable register – UPOE” on page 194. USB Pad PS/2 Pad D+ / SCK D- / SDATA Bit 7 6 543 2 1 0 - - - - - - - PS2EN PS2CON Read/Write R R R R R R R R/W Initial Value 0 0 0 0 0 0 0 0 |
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