ADE7569 datasheet(113/136 Pages) AD

113 / 136 page

Preliminary Technical Data

ADE7566/ADE7569

Rev. PrA | Page 113 of 136

Table 129. Serial Port Buffer SFR (SBUF, 0x99)

Bit No.

Mnemonic

Default

Description

7 to 0

SBUF

Serial Port Data Buffer.

Table 130. Enhanced Serial Baud Rate Control SFR (SBAUDT, 0x9E)

Bit No.

Mnemonic

Default

Description

OWE

Overwrite Error. This bit is set when new data is received and RI = 1. It indicates that SBUF was not

read before the next character was transferred in, causing the prior SBUF data to be lost. Write a 0 to

this bit to clear it.

Frame Error. This bit is set when the received frame did not have a valid stop bit. This bit is read only

and updated every time a frame is received.

Break Error. This bit is set whenever the receive data line (Rx) is low for longer than a full transmission

frame, which is the time required for a start bit, 8 data bits, a parity bit, and half a stop bit. This bit is

updated every time a frame is received.

4, 3

SBTH1, SBTH0

Extended divider ratio for baud rate setting as shown in Table 132.

2, 1, 0

DIV2, DIV1, DIV0

Binary Divider.

DIV[2:0]

Result

000

Divide by 1 (see Table 132).

001

Divide by 2 (see Table 132).

010

Divide by 4 (see Table 132).

011

Divide by 8 (see Table 132).

100

Divide by 16 (see Table 132).

101

Divide by 32 (see Table 132).

110

Divide by 64 (see Table 132).

111

Divide by 128 (see Table 132).

Table 131. UART Timer Fractional Divider SFR (SBAUDF, 0x9D)

Bit No.

Mnemonic

Default

Description

UARTBAUDEN

UART Baud Rate Enable. Set to enable UART timer to generate the baud rate. When set,

PCON.7 (SMOD), T2CON.4 (TCLK), and T2CON.5 (RCLK) are ignored.

Cleared to let the baud rate be generated as per a standard 8052.

–

Not Implemented, Write Don’t Care.

SBAUDF.5

UART Timer Fractional Divider Bit 5.

SBAUDF.4

UART Timer Fractional Divider Bit 4.

SBAUDF.3

UART Timer Fractional Divider Bit 3.

SBAUDF.2

UART Timer Fractional Divider Bit 2.

SBAUDF.1

UART Timer Fractional Divider Bit 1.

SBAUDF.0

UART Timer Fractional Divider Bit 0.

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