MEC1632 datasheet(99/636 Pages) MICROCHIP

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DS00001592B-page 99

MEC1632

7.4.2

POWER SUPPLIES AND CLOCKING

Table 7-5 illustrates clocking capabilities versus power supply availability. For more information, see Section 7.5,

"Power Configuration," on page 121.

Note 7-1

power supply states not illustrated in Table 7-5 are undefined (see also Section 7.5, "Power

Configuration," on page 121).

Note 7-2

this depends on the 32K_EN bit in the Clock Enable Register.

FIGURE 7-1:

Clock Generator BLOCK DIAGRAM

TABLE 7-5:

CLOCKS VS. POWER SUPPLIES

Power Supply States (

Note 7-1)

Clocks

VBAT

VTR

VCC

PCI Clock

32.768 KHz

Silicon

Oscillator

32.768 KHz

Crystal

Oscillator

32K

External

20 MHz

Oscillator

OFF

ON/OFF

(Note 7-2)

OFF

ON/OFF

(Note 7-4)

OFF

ON/OFF

(Note 7-5)

OFF

ON/OFF

(Note 7-3)

ON/OFF

VTR

VBAT

20 MHz

OSCILLATOR

MCLK DOMAIN

PROG.

CLOCK

DOMAIN

DIVIDER/

DRIVERS/

ENABLES

FCLK20M

FIXED

CLOCK

DOMAIN

DIVIDERS/

DRIVERS

FCLK0.1M_EN

HOST

CLOCK

DOMAIN

DIVIDERS/

DRIVERS/

ENABLES

HCLK1M_EN

VCC_PWRGD

PCLK_EC_EN

PCLK_LPC_AHB_EN

BLOCK

SLEEP

ENABLES

SLEEP_FLAG

CLOCK CONTROL & WAKE

INTERFACE

OSC_EN

Block Sleep Enables

FCLK10M_EN

PCLK_EC_AHB_EN

32K CLOCK

DOMAIN

DRIVERS

32K_CLK32768

EC INTERFACE

WAKE

ARC_CLK_DISABLE

All Block Clocking

Status Outputs

CLOCK_TREE_GATING

32.768KHZ CLOCK DOMAIN

32 KHZ CLOCK

SOURCES

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