Atmel AT88SA10HS [DATASHEET]

5

8595G

−CRYPTO−9/11

2.1

IO Tokens

There are a number of IO tokens

Input: (To AT88SA10HS)

that may be transmitted along the bus:

Wake

Wake the AT88SA10HS up from sleep (low power) state

Zero

Send a single bit from system to the AT88SA10HS with a value of zero

One Send a single bit from system to the AT88SA10HS with a value of one

Output: (From AT88SA10HS)

ZeroOut

Send a single bit from the AT88SA10HS to the system with a value of zero

OneOut

Send a single bit from the AT88SA10HS to the system with a value of one

The waveforms are the same in either direction, however there are some differences in timing based on the expectation that

the host has a very accurate and consistent clock while AT88SA10HS has significant variation in its internal clock generator

due to normal manufacturing and environmental fluctuations.

The bit timings are designed to permit a standard UART running at 230.4 K baud to transmit and receive the tokens efficiently.

Each byte transmitted or received by the UART corresponds to a single bit received or transmitted by the AT88SA10HS. See

applications notes on the Atmel website for more details.

2.2

AC Parameters

t

START

t

ZHI

t

ZLO

data comm

WAKE

LOGIC Ø

t

START

t

BIT

LOGIC 1

t

LIGNORE

t

HIGNORE

NOISE

SUPPRESION

t

WLO

t

WHI