M16C65 Datasheet, PDF (681/829 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M16C/60

Under development
M16C/65 Group
Preliminary Specification
This is a preliminary specification and is subject to change.
26. Consumer Electronics Control (CEC) Function
Header block
CEC
ST
Set to 1 by a program
H7 H6 ^{. . . .} H1 H0 EOM NACK
CTXDEN bit
CTFLG bit
Transmission starts at the rising edge
of the count source
Set to 0 by a
program
CTD8FLG bit
CTNACKFLG bit
IR bit
Set to 0 by acceptance of an
interrupt or by a program
Becomes 0 in
synchronization with
the count source.
CCTB1 register
(Do not rewrite)
CCTBE bit
Rewritable period by a
program
0
(Do not rewrite)
CCTBA bit
Rewritable period by a
program
Undefined
Rewritable period by a
program
0/1
Rewritable period by a
program
1 (NACK)
CTXDEN bit: Bit in the CECC3 register
Bits CTFLG, CTD8FLG, and CTNACKFLG: Bits in the CECFLG register
IR bit: Bit in the CEC1IC register
Bits CCTBE and CCTBA: Bits in the CCTB2 register
The above diagram applies under the following conditions.
y The CTISEL2 bit in the CISEL register is set to 1 (transmit NACK interrupt enabled).
y The CTNACK bit in the CECC2 register is set to 1, and the CTACKEN bit is 1 (transmission stops with NACK).
Figure 26.15 Transmission Example (When NACK Received)
REJ09B0484-0030 Rev.0.30 Sep 09, 2008
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