PC87413 datasheet(30/257 Pages) NSC

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1.0 Signal/Pin Connection and Description (Continued)

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Revision1.2

1.4.12

Power and Ground

1.5

INTERNAL PULL-UP AND PULL-DOWN RESISTORS

The signals listed in Table 3 have internal pull-up (PU) and/or pull-down (PD) resistors. The internal resistors are optional

for those signals indicated as “Programmable”. See Section 11.3 on page 236 for the values of each resistor type.

Signal

Pin(s)

I/O Buffer Type

Power

Well

Description

VSS

11, 43, 68,

93, 115

GND

Ground. Serves for both on-chip logic, output drivers and back-

up battery circuit.

VDD

69, 92,

116

PWR

Digital 3.3V Power Supply. Serves as power supply for the

legacy peripherals and the LPC Interface.

VSB

12, 40

PWR

Standby Digital 3.3V Power Supply. Used for the ACB and

X-Bus Interfaces, the GPIO ports and the clock generator. When

active, it also powers the RTC and the SWC.

VBAT

INULR

Battery Power Supply. When VSB is off, this supply provides

battery back-up to the SWC registers, to the RTC and to the

32 KHz crystal oscillator. The pin is connected to the internal

logic through a series resistor for UL-compliant protection.

Table 3. Internal Pull-Up and Pull-Down Resistors

Signal

Pin/s

Type

Comments

Parallel Port

ACK

PU220

AFD_DSTRB

PU440

BUSY_WAIT

PD120

ERR

PU220

INIT

PU440

PU220/

PD110

Programmable

SLCT

PD110

SLIN_ASTRB

PU440

STB_WRITE

PU440

PPDIS

121

PU25

Keyboard and Mouse Controller (KBC)

P12, P16, P17

121, 70, 66

PU25

ACCESS.bus (ACB) Interface (PC87413 and PC87417)

ACBCLK

PU25

Programmable1

ACBDAT

PU25

Programmable1

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