9202 datasheet(81/175 Pages) STMICROELECTRONICS

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UPSD3254A, UPSD3254BV, UPSD3253B, UPSD3253BV

Address Register (SxADR: S1ADR, S2ADR)

This 8-bit register may be loaded with the 7-bit

slave address to which the controller will respond

when programmed as a slave receive/transmitter.

The Start/Stop Hold Time Detection and System

Clock registers (Tables 57 and 58) are included in

the I2C unit to specify the start/stop detection time

to work with the large range of MCU frequency val-

ues supported. For example, with a system clock

of 40MHz.

Table 56. Address Register (SxADR)

Note: 1. SLA6 to SLA0: Own slave address.

Table 57. Start /Stop Hold Time Detection Register (S1SETUP, S2SETUP)

Table 58. System Cock of 40MHz

Table 59. System Clock Setup Examples

543210

SLA6

SLA5

SLA4

SLA3

SLA2

SLA1

SLA0

—

Address

Reset Value

Note

SFR

D1h

S1SETUP

00h

To control the start/stop hold time detection for the DDC module

in Slave Mode

D2h

S2SETUP

00h

To control the start/stop hold time detection for the multi-master

I²C module in Slave Mode

S1SETUP,

S2SETUP Register

Value

Number of Sample

Clock (fOSC/2 ->

50ns)

Required Start/

Stop Hold Time

Note

00h

1EA

50ns

When Bit 7 (enable bit) = 0, the number of

sample clock is 1EA (ignore Bit 6 to Bit 0)

80h

1EA

50ns

81h

2EA

100ns

82h

3EA

150ns

...

8Bh

12EA

600ns

Fast Mode I²C Start/Stop hold time specification

...

FFh

128EA

6000ns

System Clock

S1SETUP,

S2SETUP Register

Value

Number of Sample

Clock

Required Start/Stop Hold Time

40MHz (fOSC/2 -> 50ns)

8Bh

12 EA

600ns

30MHz (fOSC/2 -> 66.6ns)

89h

9 EA

600ns

20MHz (fOSC/2 -> 100ns)

86h

6 EA

600ns

8MHz (fOSC/2 -> 250ns)

83h

3 EA

750ns

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