DOC7707 datasheet(220/307 Pages) ETC1

Part #	DOC7707

Description	Microcontroller with 8/16K Bytes of ISP Flash and USB Controller

PDF	307 Pages

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Manufacturer	ETC1 [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

543

PS2EN

PS2CON

Read/Write

R/W

Initial Value

DOC7707 Datasheet(PDF) 220 Page - List of Unclassifed Manufacturers