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PXAS30KFA

XA 16-bit microcontroller 32 K/1 K OTP/ROM/ROMless, 8-channel 8-bit A/D, low voltage (2.7 V–5.5 V), I2C, 2 UARTs, 16 MB address range

Philips Electronics 

Philips Semiconductors

XA 16-bit microcontroller

32 K/1 K OTP/ROM/ROMless, 8-channel 8-bit A/D, low voltage (2.7 V–5.5 V),

I2C, 2 UARTs, 16 MB address range

Preliminary specification

XA-S3

ADCS Address:43Fh

Bit Addressable

Reset Value: 00h

BIT

ADCS.7

ADCS.6

ADCS.5

ADCS.4

ADCS.3

ADCS.2

ADCS.1

ADCS.0

SYMBOL

ADCS7

ADCS6

ADCS5

ADCS4

ADCS3

ADCS2

ADCS1

ADCS0

MSB

LSB

ADCS7 ADCS6 ADCS5 ADCS4 ADCS3 ADCS2 ADCS1 ADCS0

FUNCTION

A/D channel 7 select bit.

A/D channel 6 select bit.

A/D channel 5 select bit.

A/D channel 4 select bit.

A/D channel 3 select bit.

A/D channel 2 select bit.

A/D channel 1 select bit.

A/D channel 0 select bit.

Figure 2. A/D Channel Select Register (ADCS)

SU00939

ADCFG Address:4B9h

Not bit Addressable

Reset Value: 00h

BIT

ADCFG.7

ADCFG.6

ADCFG.5

ADCFG.4

ADCFG.3–0

SYMBOL

—

—

—

—

ADCFG

MSB

—

—

—

—

LSB

A/D Timing Configuration

FUNCTION

Reserved for future use. Should not be set to 1 by user programs.

Reserved for future use. Should not be set to 1 by user programs.

Reserved for future use. Should not be set to 1 by user programs.

Reserved for future use. Should not be set to 1 by user programs.

A/D timing configuration (see text and table).

Figure 3. A/D Timing Configuration Register (ADCFG)

SU00940

Table 2. A/D Timing Configuration

ADCFG.3–0

Max. Oscillator

Frequency (MHz)

Conversion Time

Osc. Clocks

µsec at max. Osc.

Sampling Time

(Osc. Clocks)

0h (0000)

6.66

72

10.81

4

1h (0001)

10

76

7.6

6

2h (0010)

11.11

80

7.2

8

3h (0011)

13.33

96

7.2

8

4h (0100)

16.66

100

6.0

10

5h (0101)

20

104

5.2

12

6h (0110)1

20

116

5.8

24

7h (0111)

22.2

108

4.86

14

8h (1000)

23.3

124

5.32

14

9h (1001)

26.6

128

4.81

16

Ah (1010)

30

132

4.4

18

Bh (1011)1

30

146

4.87

32

Ch (1100)

–

136

4.25

20

Dh (1101)

–

152

4.56

20

Eh (1110)

–

172

4.7

22

Fh (1111)

–

176

4.4

24

NOTE:

1. These settings provide additional A/D input sampling time, in order to allow accurate readings with a higher external source impedance.

2000 Dec 01

15

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