MEC1632 datasheet(5/636 Pages) MICROCHIP

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DS00001592B-page 5

MEC1632

1.0

CHANGE LIST

This chapter lists the changes from the MEC1618.

1.1

New Package

• The 156 pin package is replaced by a 169 pin package.

1.2

Additional Clock Trees

• The number of EC clock trees is increased from 4 independent trees to 6 independent trees.

• See Table 7-12, “Master Clock Tree Block Allocation,” on page 109.

1.3

Additional SMBus Controller

• A fourth SMBus controller is added. It can be directed to any of the current 12 ports. See Table 27-2, “SMB Device

Interface Base Address Table,” on page 433.

• Two additional DMA channels are added to support the additional SMBus controller. See Table 26-3, “DMA Device

Selection,” on page 423, Table 26-4, “DMA Controller Base Address Table,” on page 426 and Section 26.8.1,

"DMA Control Register," on page 427.

1.4

Additional GPIO pins

• There are 7 additional GPIO pins available.

1.5

Additional BGPO pins

• Five additional BGPO pins are added, for a total of 6. See the description in Section 22.8.1, "Week Timer Control

1.6

UART-based Flash Reprogram strap

• A strap option is added that will be checked at VTR POR. If asserted, the UART-based Flash reprogram function

in the ROM will execute unconditionally, ignoring the contents of the Flash.

See Section 42.4, "UART Boot Strap Option," on page 568.

1.7

Increased LED Drive Strength

• The pins for the 3 blinking/breathing LEDs are changed from 8ma to 20ma pads.

• Optional configurable LED to LED skew control is added to the Blinking LED block, in order to minimize current

drain when switching the higher-current signals.

1.8

EEPROM Enhancements

• Reading, writing and erasing blocks of the EEPROM will be independent of the main Flash array.

• The size of the EEPROM is increased to 2K Bytes.

The EEPROM is described Section 15.0, "EEPROM".

1.9

Crystal Oscillator and Real Time Clock

• A 32.768KHz crystal oscillator, with two crystal pins and a private power/ground pair of pins, can be used to

source the internal 32KHz clock domain, in lieu of the silicon oscillator or an external pin.

• A standard battery-powered Real Time Clock is added. The RTC will not include CMOS memory. See Section

23.0, "RTC With Date and DST Adjustment," on page 375.

There are changes to the Clock Enable Register (See Section 7.9.2, "Clock Enable Register," on page 149).

A description of the Crystal Oscillator and the 32KHz clock domain switching can be found in Section 7.4.4, "32.768 KHz

Crystal Oscillator," on page 101 and Section 7.4.6, "32 KHz Clock Domain Switching," on page 103.

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