CL-PS7110 查看數據表（PDF） - Cirrus Logic

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CL-PS7110

Low-Power System-on-a-Chip

Cirrus Logic 

CL-PS7110

Low-Power System-on-a-Chip

3.2.11 SYSCON — System Control Register

The System Control register is a 24-bit read/write register that controls all the general configuration of the

CL-PS7110 as well as modes for peripheral devices. All bits in this register are cleared by a system reset.

The bits in SYSCON are defined in Table 3-3.

Table 3-3. Bits in SYSCON

7

TC2S

15

SIREN

23

6

5

TC2M

TC1S

14

13

CDENRX CDENTX

22

21

Reserved

4

TC1M

12

LCDEN

20

IRTXM

3

Keyboard scan

11

10

DBGEN

BZMOD

19

18

WAKEDIS EXCKEN

0

9

8

BZTOG

UARTEN

17

16

ADCKSEL

Keyboard Scan is a 4-bit field that defines the state of the keyboard column drives, as shown in Table 3-4.

Table 3-4. Keyboard Scan Field

Keyboard Scan

Column

0a

1a

2–7a

8

9

10

11

12

13

14

15

All driven high

All driven low

All high impedance (tristate)

Column 0 only driven high all others high impedance

Column 1 only driven high all others high impedance

Column 2 only driven high all others high impedance

Column 3 only driven high all others high impedance

Column 4 only driven high all others high impedance

Column 5 only driven high all others high impedance

Column 6 only driven high all others high impedance

Column 7 only driven high all others high impedance

a Used for test purposes only.

May 1997

DATA BOOK v1.5

43

PROGRAMMING INTERFACE

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