ATA5811 datasheet(39/90 Pages) ATMEL

39 / 90 page

ATA5811/ATA5812 [Preliminary]

4689B–RKE–04/04

Status Register

The status register indicates the current status of the transceiver and is readable via the

4-wire serial interface. Setting Power_On or P_On_Aux or an event on ST1, ST2, ST3,

ST4 or ST5 is indicated by an IRQ.

Reading the status register resets the bits Power_On, Low_Batt, P_On_Aux and the

IRQ

Status Register (ADR 8)

Table 35. Status Register

Status Bit

Function

ST5

Status of pin T5

Pin T5 = 0

→ST5 = 1

Pin T5 = 1

→ST5 = 0

(see Figure 29 on page 41)

ST4

Status of pin T4

Pin T4 = 0

→ST4 = 1

Pin T4 = 1

→ST4 = 0

(see Figure 29 on page 41)

ST3

Status of pin T3

Pin T3 = 0

→ST3 = 1

Pin T3 = 1

→ST3 = 0

(see Figure 29 on page 41)

ST2

Status of pin T2

Pin T2 = 0

→ST2 = 1

Pin T2 = 1

→ST2 = 0

(see Figure 29 on page 41)

ST1

Status of pin T1

Pin T1 = 0

→ST1 = 1

Pin T1 = 1

→ST1 = 0

(see Figure 29 on page 41)

Power_On

Indicates that the transceiver was woken up by pin PWR_ON (rising edge on pin

PWR_ON). During Power_On = 1, the bits VSOUT_EN and CLK_ON in control

(see Figure 30 on page 42)

Low_Batt

Indicates that output voltage on pin VSOUT is too low

VSOUT < 2.38 V typically)

(see Figure 31 on page 43)

P_On_Aux

Indicates that the auxiliary supply voltage on pin VAUX is high enough to operate.

State transition:

a) OFF mode

→AUX mode (see Figure 22 on page 28)

b) Idle mode (VSOUT = VS1)

→Idle mode (VSOUT = V_REG2)

(see Figure 32 on page 44)

ATA5811 Datasheet(PDF) 39 Page - ATMEL Corporation

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