MEC1322 datasheet(359/456 Pages) MICROCHIP

359 / 456 page

 2014 - 2015 Microchip Technology Inc.

DS00001719D-page 359

MEC1322

The maximum speed at which the BC-Link Master Interface can operate reliably depends on the drive strength of the

BC-Link BCM_CLK and BCM_DAT pins, as well as the nature of the connection to the Companion device (over ribbon

cable or on a PC board). The following table shows the recommended maximum speeds over a PC board as well as a

12 inch ribbon cable for selected drive strengths. The frequency is set with the BC-Link Clock Select Register.

31.6

Host Interface

The registers defined for the BC-Link Master Interface are accessible by the various hosts as indicated in Section 31.11,

"EC-Only Registers".

31.7

Power, Clocks and Reset

31.7.1

POWER DOMAINS

31.7.2

CLOCK INPUTS

31.7.3

RESETS

31.8

Interrupts

This section defines the Interrupt Sources generated from this block.

TABLE 31-2:

BC-LINK MASTER PIN DRIVE STRENGTH VS. FREQUENCY

Pin Drive

Strength

Max Freq

on PC Board

Min Value in

BC-Link Clock Select

Max Freq

over Ribbon cable

Min Value in

BC-Link

Clock Select Register

16mA

24Mhz

16Mhz

TABLE 31-3:

POWER SOURCES

Name

Description

VCC1

The logic and registers implemented in this block are powered by this

power well.

TABLE 31-4:

CLOCK INPUTS

Name

Description

48 MHz Ring Oscillator

This is the clock source for Keyboard Scan Interface logic.

TABLE 31-5:

RESET SIGNALS

Name

Description

VCC1_RESET

This signal resets all the registers and logic in this block to their default

state.

TABLE 31-6:

EC INTERRUPTS

Source

Description

BCM_INT Busy

Interrupt request to the Interrupt Aggregator, generated from the status

event BUSYdefined in the BC-Link Status Register.

BCM_INT Err

Interrupt request to the Interrupt Aggregator, generated from the status

event defined in the BC-Link Status Register.

BC_INT_N_WK

Wake-up request to the Interrupt Aggregator’s wake-up interface for BC-

Link Master port.

In order to enable BC-Link wakeup interrupts, the pin control registers for

the BC_INT# pin must be programmed to Input, Falling Edge Triggered,

non-inverted polarity detection.

MEC1322 Datasheet(PDF) 359 Page - Microchip Technology

MEC1322 Datasheet(HTML) 359 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL