P83CL882TSLASH001 datasheet(49/88 Pages) PHILIPS

49 / 88 page

2001 Jun 19

Philips Semiconductors

Product speciﬁcation

80C51 Ultra Low Power (ULP) telephony controller

P83CL882

6.8.3

ADDRESS REGISTER (S1ADR)

The CPU can read from and write to this 8-bit SFR. S1ADR is not affected by the SIO1 hardware. The contents of this

In the Slave modes, the seven most significant bits must be loaded with the microcontrollers own slave address, and, if

the least significant bit is set, the general call address (00H) is recognized; otherwise it is ignored. Reset initializes

S1ADR to 00H.

Table 62 Address Register (SFR address DBH)

Table 63 Description of S1ADR bits

6.8.4

SERIAL STATUS REGISTER (S1STA)

S1STA is an 8-bit read-only Special Function Register. The three least significant bits are always zero. The five most

significant bits contain the status code. There are 26 possible status codes. When S1STA contains F8H, no relevant

state information is available and no serial interrupt is requested. Reset initializes S1STA to F8H. All other S1STA values

correspond to defined SIO1 states. When each of these states is entered, a serial interrupt is requested (SI = 1).

The status codes for all possible modes of the I2C-bus interface are given in Table 66.

The contents of this register may be used as a vector to a service routine. This optimizes the response time of the

software and consequently that of the I2C-bus. S1STA is a read-only register.

Table 64 Serial Status Register (SFR address D9H)

Table 65 Description of S1STA bits

76543210

SLA6

SLA5

SLA4

SLA3

SLA2

SLA1

SLA0

BIT

SYMBOL

DESCRIPTION

7 to 1

SLA[6:0]

These bits correspond to the 7-bit slave address which will be recognized on the

incoming data stream from the I2C-bus; when the slave address is detected and the

interface is enabled, a serial interrupt will be generated to the CPU.

This bit is used to determine whether the general CALL address is recognized. When a

logic 0, the general CALL address is not recognized; when a logic 1, the general CALL

address is recognized.

76543210

SC4

SC3

SC2

SC1

SC0

BIT

SYMBOL

DESCRIPTION

3 to 7

SC[4:0]

5-bit status code

0to2

−

these three bits are held LOW

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