MFC2000 datasheet(346/426 Pages) ETC

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MFC2000 Multifunctional Peripheral Controller 2000

Hardware Description

18-2

Conexant

100723A

18.2 Real-Time Clock (RTC) Registers

Note:

All RTC registers are cleared only by battery power-on reset or a write to the RTC

control register.

As you can see, second and minute are in the same 16-bit register. Hour_Day, and Month_Year registers have

the same arrangement. If CPU does a 16-bit write to the Hour_Day register, both hour and day will increment. If

CPU only writes to the lower 8-bit or the upper 8-bit, only hour or only day will increment. The Month_Year

lower 8-bit write to the Sec_Min register, year, month, day, hour, and minute will increment once. If CPU only

writes to the upper 8-bit, only minute will increment.

Address:

Bit 15

Bit 14

Bit 13

Bit 12

Bit 11

Bit 10

Bit 9

Bit 8

Default:

Second and Minute

(Sec_Min)

01FF8091

Busy Flag

(R)

(Not Used)

Read: Data Range 000000 - 111011

Write: increment minute, (data is a don’t care)

Rst. Value

0x000000b

Read Value

00h

Address:

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default:

Second and Minute

(Sec_Min)

01FF8090

Busy Flag

(R)

(Not Used)

Read: Data Range 000000 - 111011

Write: increment all - year,month,day,hour and minute registers, (data is a don’t

care)

Rst. Value

0x000000b

Read Value

00h

Increment all will increment the year, month, day, hour, and minute registers by one.

Address:

Bit 15

Bit 14

Bit 13

Bit 12

Bit 11

Bit 10

Bit 9

Bit 8

Default:

Hour and day

(Hour_Day)

01FF8093

Busy Flag

(R)

(Not Used)

Read: Data Range 00000 - 11110

Write: increment day (data is a don’t care)

Rst. Value

0xx00000b

Read Value

00h

Address:

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default:

Hour and Day

(Hour_Day)

01FF8092

Busy Flag

(R)

(Not Used)

Read: Data Range 00000 - 10111

Write: increment hour (data is a don’t care)

Rst. Value

0xx00000b

Read Value

00h

Address:

Bit 15

Bit 14

Bit 13

Bit 12

Bit 11

Bit 10

Bit 9

Bit 8

Default:

Month and Year

(Month_Year)

01FF8095

Busy Flag

(R)

(Not Used)

Read: Data Range 00000 - 11111

Write: increment year (data is a don’t care)

Rst. Value

0xx00000b

Read Value

00h

Address:

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default:

Month and Year

(Month_Year)

01FF8094

Busy Flag

(R)

(Not Used)

Read: Data Range 0000 - 1011

Write: increment month, (data is a don’t care)

Rst.Value

0xxx0000b

Read Value

00h

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