SC2200 datasheet(121/433 Pages) NSC

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SuperI/O Module (Continued)

Table 4-20. RTC Registers

Bit

Description

Index 00h

Seconds Register - SEC (R/W)

Reset Type: VPP PUR

7:0

Seconds Data. Values may be 00 to 59 in BCD format or 00 to 3B in binary format.

Index 01h

Seconds Alarm Register - SECA (R/W)

Reset Type: VPP PUR

7:0

Seconds Alarm Data. Values may be 00 to 59 in BCD format or 00 to 3B in binary format.

When bits 7 and 6 are both set to one (“11”), unconditional match is selected.

Index 02h

Minutes Register - MIN (R/W)

Reset Type: VPP PUR

7:0

Minutes Data. Values canbe 00to59inBCD format, or 00 to 3Binbinaryformat.

Index 03h

Minutes Alarm Register - MINA (R/W)

Reset Type: VPP PUR

7:0

Minutes Alarm Data. Values canbe00 to 59in BCD format, or00 to3Binbinaryformat.

When bits 7 and 6 are both set to 1, unconditional match is selected. See Section 4.5.2.5 "Alarms" on page 116 for more

information about "unconditional" matches.

Index 04h

Hours Register - HOR (R/W)

Reset Type: VPP PUR

7:0

Hours Data. For 12-hour mode, values can be 01 to 12 (AM) and 81 to 92 (PM) in BCD format, or 01 to 0C (AM) and 81 to

8C (PM) in binary format. For 24-hour mode, values can be 0- to 23 in BCD format or 00 to 17 in binary format.

Index 05h

Hours Alarm Register - HORA (R/W)

Reset Type: VPP PUR

7:0

Hours Alarm Data. For 12-hour mode, values may be 01 to 12 (AM) and 81 to 92 (PM) in BCD format or 01 to 0C (AM) and

81 to 8C (PM) in Binary format. For 24-hour mode, values may be 0- to 23 in BCD format or 00 to 17 in Binary format.

When bits 7 and 6 are both set to one (“11”), unconditional match is selected.

Index 06h

Day of Week Register - DOW (R/W)

Reset Type: VPP PUR

7:0

Day Of Week Data. Values may be 01 to 07 in BCD format or 01 to 07 in binary format.

Index 07h

Date of Month Register - DOM (R/W)

Reset Type: VPP PUR

7:0

Date Of Month Data. Values may be 01 to 31 in BCD format or 01 to 1F in binary format.

Index 08h

Month Register - MON (R/W)

Reset Type: VPP PUR

Width: Byte

7-0

Month Data. Values may be 01 to 12 in BCD format or 01 to 0C in binary format.

Index 09h

Year Register - YER (R/W)

Reset Type: VPP PUR

7:0

Year Data. Values may be 00 to 99 in BCD format or 00 to 63 in binary format.

Index 0Ah

RTC Control Register A - CRA (R/W)

Reset Type: Bit Specific

This register controls test selection, among other functions. This register cannot be written before reading bit 7 of CRD.

Update in Progress. (RO) This bit is not affected by reset. This bit reads 0 when bit 7 of the CRB Register is 1.

0: Timing registers not updated within 244

µs.

1: Timing registers updated within 244

µs.

6:4

Divider Chain Control. These bits control the configuration of the divider chain for timing generation and register bank

selection. See Table 4-21 on page 123. They are cleared to 000 as long as bit 7 of CRD is 0.

3:0

Periodic Interrupt Rate Select. These bits select one of fifteen output taps from the clock divider chain to control the rate of

the periodic interrupt. See Table 4-22 on page 123 and Figure 4-7 on page 115. They are cleared to 000 as long as bit 7 of

CRD is 0.

Index 0Bh

RTC Control Register B - CRB (R/W)

Reset Type: Bit Specific

Set Mode. This bit is reset at VPP power-up reset only.

0: Timing updates occur normally.

1: User copy of time is “frozen”, allowing the time registers to be accessed whether or not an update occurs.

Periodic Interrupt. Bits [3:0] of the CRA Register determine the rate at which this interrupt is generated. It is cleared to 0 on

RTC reset (i.e., hardware or software reset) or when RTC is disable.

0: Disable.

1: Enable.

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