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3 serial interface status register, Ata6264 [preliminary – Atmel ATA6264 User Manual

Page 74

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4929B–AUTO–01/07

ATA6264 [Preliminary]

22.3

Serial Interface Status Register

For all serial interface commands except the test-mode commands (55AAh, AA55h, 5500h), the
ATA6264 status is available at the MISO line. For the status register a 16-bit structure is used,
one bit for each information.

Table 22-10. Status Register

Byte A

Byte B

MSBit

LSBit MSBit

LSBit

a7

a6

a5

a4

a3

a2

a1

a0

b7

b6

b5

b4

b3

b2

b1

b0

Table 22-11. Information Provided by the Itemized Bits of the Status Register

Bit

Set To

Information

a7

High

Chip temperature reports overtemperature

Low

Chip temperature reports normal temperature

a6

High

Overtemperature at K1 output

Low

Normal temperature at K1 output

a5

High

Overtemperature at K2 output

Low

Normal temperature at K2 output

a4

High

Latch for GKEY function is set

Low

Latch for GKEY function is not set

a3

High

EVZ switched to 33V, EVZ switched to external divider

Low

EVZ switched to 23V

a2

High

CP-OUT switch is low impedance

Low

CP-OUT switch is high ohmic

a1

High

CP-OUT voltage too low

Low

CP-OUT voltage is in correct voltage range

a0

High

CP voltage too low

Low

CP voltage is in correct voltage range

b7

High

Voltage at pin USP above detection threshold

Low

Voltage at pin USP below detection threshold

b6

High

GNDA or GNDB disconnected

Low

GNDA and GNDB connected

b5

High

Previously sent serial interface command was invalid (default after power-on reset)

Low

Previously sent serial interface command was valid

b4

High

Error during last serial interface transmission (default after power-on reset)

Low

No error during last serial interface transmission

b3

High

IC is in Test mode

Low

IC is in Normal mode

b2

Reflects bit b2 of the watchdog prescaler

b1

Reflects bit b1 of the watchdog prescaler

b0

Reflects bit b0 of the watchdog prescaler