Renesas M16C/64C User Manual page 638

M16C/64C Group
26.3.5.4 ACK Bit Output
The output value of the tenth bit (ACK bit) can be selected.
When the CRACK bit in the CECC2 register is 0 (inserted by program), the value of the CCRBAO bit
in the CCRB2 register is output as ACK data.
When the CRACK bit is 1 (inserted by hardware), ACK is output when the received Destination
address matches the address selected by the CRADRI1 or CRADRI2 register (own address). Table
26.8 lists ACK Output.
Table 26.8 ACK Output
CRACK CCRBAO
Bit Bit
0
0
1
1 -
R01UH0092EJ0110 Rev.1.10
Jul 31, 2012
Received destination
address
-
-
Direct
(0000b to 1110b)
Broadcast
(1111b)
26. Consumer Electronics Control (CEC) Function
Destination Address
Address selected by the CRADRI1 or
CRADRI2 register (own address)
-
-
Matches received Destination address
Not match received Destination address
1111b (matches received Destination address)
0000b to 1110b
ACK
Output
ACK
NACK
ACK
NACK
ACK
NACK
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