R01UH0092EJ0110 Rev.1.10
Page 584 of 807
Jul 31, 2012
M16C/64C Group
26. Consumer Electronics Control (CEC) Function
Figure 26.1
CEC Function Block Diagram
Table 26.3
I/O Pin
Pin Name
I/O
Description
CEC
Input/Output
CEC input and output (N-channel open drain output)
Note:
1.
Set the direction bit of the ports sharing a pin to 0 (input mode).
Receiving
circuit
Address
comparator
CCRB1
CRADRI1
CRADRI2
ACK output
Arbitration
detection
Transmission
circuit
Clock control
circuit
Digital
filter
Start bit
detection
CDATRNG
CCTBA
CCRBE
CCRBAI
CRFLG
CCRBAO
CTABTS
CTD8FLG
CTABTFLG
(Detect arbitration lost)
Detect Destination
address match or
Broadcast
CRD8FLG
(Detect reception of
8/10 bits of data)
CTNACKFLG
(Detect NACK in
transmission)
CRERRFLG
(Receive signals outside
tolerated range)
CRXDEN
0
1
0
1
CTXDEN
fC
Timer A underflow
CCLK1 to CCLK0
00b
01b
Supply to CEC blocks
(32.768 kHz)
Detect transmission
of 8 bits of data
CEC
CRACK
CFIL
PCR4
CSTRRNG
CRRNG
CCTB1
CTNACK, CTACKEN
CCTBE
CTFLG
CCLK1, CCLK0: Bits in the CECC1 register
CRRNG, CTNACK, CTACKEN, CRACK, CTABTS, CFIL, CSTRRNG, CDATRNG: Bits in the CECC2 register
CTXDEN, CRXDEN: Bits in the CECC3 register
CRFLG, CTFLG, CRERRFLG, CTABTFLG, CTNACKFLG, CRD8FLG, CTD8FLG : Bits in the CECFLG register
CCTBE, CCTBA: Bits in the CCTB2 register
CCRBE, CCRBAO, CCRBAI: Bits in the CCRB2 register
PCR4: Bit in the PCR register
CCTB1: CCTB1 register
CCRB1: CCRB1 register
CRADRI1, CRADRI2: Registers CRADRI1 and CRADRI2
0/1
determination
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