CL-PS7111-VC-A 查看數據表（PDF） - Cirrus Logic

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CL-PS7111-VC-A

Low-Power System-on-a-Chip

Cirrus Logic 

CL-PS7111

Low-Power System-on-a-Chip

Bit Description (cont.)

3:0 Keyboard Scan: This 4-bit field that defines the state of the keyboard column drives.

Keyboard Scan

Column

0

All driven high

1

All driven low

2–7

All high impedance (tristate)

8

Column 0 only driven high, all others high impedance

9

Column 1 only driven high, all others high impedance

10

Column 2 only driven high, all others high impedance

11

Column 3 only driven high, all others high impedance

12

Column 4 only driven high, all others high impedance

13

Column 5 only driven high, all others high impedance

14

Column 6 only driven high, all others high impedance

15

Column 7 only driven high, all others high impedance

5.9 System Status Flags Register 1 — SYSFLG1

31

30

29

VERID

ID

23

22

21

UTXFF1

URXFE1

15

14

13

CLDFLG

PFFLG

RSTFLG

7

6

5

DID

28

BOOTBIT1

20

12

NBFLG

4

27

26

BOOTBIT0 SSIBUSY

19

18

RTCDIV

11

10

UBUSY1

DCD

3

2

WUON

WUDR

25

CTXFF

17

9

DSR

1

DCDET

24

CRXFE

16

8

CTS

0

MCDR

The System Status Flags register 1 is a 32-bit read-only register that indicates various system informa-

tion.

Bit Description

31:30

VERID: Version ID bits. These two bits determine the version identification for the CL-PS7111. Reads ‘0’ for the first ver-

sion.

29 ID: Always reads ‘1’ for the CL-PS7111. Always reads ‘0’ for the CL-PS7110.

50

REGISTER DESCRIPTIONS

September 1997

PRELIMINARY DATA BOOK v2.0

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