Rainbow Electronics ATmega128RFA1 - Manual (Page 404)

404
8266A-MCU Wireless-12/09
ATmega128RFA1
Register Bits Value Description
returned.
0x58 Data byte has been received; NOT ACK has
been returned.
0x60 Own SLA+W has been received; ACK has
been returned.
0x68 Arbitration lost in SLA+R/W as Master; own
SLA+W has been received; ACK has been
returned.
0x70 General call address has been received;
ACK has been returned.
0x78 Arbitration lost in SLA+R/W as Master;
general call address has been received;
ACK has been returned.
0x80 Previously addressed with own SLA+W; data
has been received; ACK has been returned.
0x88 Previously addressed with own SLA+W; data
has been received; NOT ACK has been
returned.
0x90 Previously addressed with general call; data
has been received; ACK has been returned.
0x98 Previously addressed with general call; data
has been received; NOT ACK has been
returned.
0xA0 A STOP condition or repeated START
condition has been received while still
addressed as Slave.
0xA8 Own SLA+R has been received; ACK has
been returned.
0xB0 Arbitration lost in SLA+R/W as Master; own
SLA+R has been received; ACK has been
returned.
0xB8 Data byte in TWDR has been transmitted;
ACK has been received.
0xC0 Data byte in TWDR has been transmitted;
NO ACK has been received.
0xC8 Last data byte in TWDR has been
transmitted (TWEA = 0); ACK has been
received.
0xF8 No relevant state information available;
TWINT = 0.
• Bit 2 – Res - Reserved Bit
This bit is reserved for future use. A read access always will return zero. A write access
does not modify the content.
• Bit 1:0 – TWPS1:0 - TWI Prescaler Bits
These bits can be read and written and control the bit rate of the prescaler.
Table 25-9 TWPS Register Bits
Register Bits Value Description
TWPS1:0 0x00 1