SC26C92 datasheet(18/31 Pages) PHILIPS

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Philips Semiconductors

Product specification

SC26C92

Dual universal asynchronous receiver/transmitter (DUART)

2000 Jan 31

applied via CRB. After reading or writing MR0B, the pointer will

point to MR1B.

The bit definitions for this register are identical to MR0A, except that

all control actions apply to the Channel B receiver and transmitter

and the corresponding inputs and outputs. MR0B[3:0] are reserved.

MR1B – Channel B Mode Register 1

MR1B is accessed when the Channel B MR pointer points to MR1.

The pointer is set to MR1 by RESET or by a ‘set pointer’ command

applied via CRB. After reading or writing MR1B, the pointer will

point to MR2B.

The bit definitions for this register are identical to MR1A, except that

all control actions apply to the Channel B receiver and transmitter

and the corresponding inputs and outputs.

MR2B – Channel B Mode Register 2

MR2B is accessed when the Channel B MR pointer points to MR2,

which occurs after any access to MR1B. Accesses to MR2B do not

change the pointer.

The bit definitions for mode register are identical to the bit

definitions for MR2A, except that all control actions apply to the

Channel B receiver and transmitter and the corresponding inputs

and outputs.

CSRA – Channel A Clock Select Register

CSRA[7:4] – Channel A Receiver Clock Select

This field selects the baud rate clock for the Channel A receiver.

The field definition is shown in Table 5.

CSRB[7:4]

ACR[7] = 0

ACR[7] = 1

1110

1111

IP4-16X

IP4-1X

IP4-16X

IP4-1X

The receiver clock is always a 16X clock except for CSRB[7:4] = 1111.

CSRA[3:0] – Channel A Transmitter Clock Select

This field selects the baud rate clock for the Channel A transmitter.

The field definition is as shown in Table 5, except as follows:

CSRA[3:0]

ACR[7] = 0

ACR[7] = 1

1110

1111

IP3-16X

IP3-1X

IP3-16X

IP3-1X

The transmitter clock is always a 16X clock except for CSR[3:0] = 1111.

CSRB – Channel B Clock Select Register

CSRB[7:4] – Channel B Receiver Clock Select

This field selects the baud rate clock for the Channel B receiver.

The field definition is as shown in Table 5, except as follows:

CSRB[7:4]

ACR[7] = 0

ACR[7] = 1

1110

1111

IP6-16X

IP6-1X

IP6-16X

IP6-1X

The receiver clock is always a 16X clock except for CSRB[7:4] = 1111.

CSRB[3:0] – Channel B Transmitter Clock Select

This field selects the baud rate clock for the Channel B transmitter.

The field definition is as shown in Table 5, except as follows:

CSRB[3:0]

ACR[7] = 0

ACR[7] = 1

1110

1111

IP5-16X

IP5-1X

IP5-16X

IP5-1X

The transmitter clock is always a 16X clock except for

CSRB[3:0] = 1111.

Table 5.

Baud Rate (Base on a 3.6864MHz crystal clock)

MR0[0] = 0 (Normal Mode)

MR0[0] = 1 (Extended Mode I)

MR0[2] = 1 (Extended Mode II)

CSRA[7:4]

ACR[7] = 0

ACR[7] = 1

ACR[7] = 0

ACR[7] = 1

ACR[7] = 0

ACR[7] = 1

0000

300

450

4,800

7,200

0001

110

880

0010

134.5

1,076

0011

200

150

1200

900

19.2K

14.4K

0100

300

1800

28.8K

0101

600

3600

57.6K

0110

1,200

7200

7,200

115.2K

0111

1,050

2,000

1,050

2,000

1,050

2,000

1000

2,400

14.4K

57.6K

1001

4,800

28.8K

4,800

1010

7,200

1,800

7,200

1,800

57.6K

14.4K

1011

9,600

57.6K

9,600

1100

38.4K

19.2K

230.4K

115.2K

38.4K

19.2K

1101

Timer

1110

IP4-16X

1111

IP4-1X

NOTE: The receiver clock is always a 16X clock except for CSRA[7:4] = 1111.

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