M16C65 Datasheet, PDF (816/829 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.
31. Precautions
31.24 Notes on CEC (Consumer Electronics Control)
31.24.1 Registers and Bit Operation
The registers and the bits of the CEC function are synchronized with the count source. Therefore, the
internal circuit starts to operate from the next count source timing, while the contents of the register is
changed immediately after rewriting the value of the register.
When changing the value of the same bit successively or reading the bit changed under the influence of
another bit, wait for one or more cycles of the count source.
Example: when changing the value of the same bit successively
(1) Change the bit to 0.
(2) Wait for one or more cycles of the count source.
(3) Change the same bit to 1.
Example: when reading the bit changed under the influence of another bit
(after the reception is disabled, to ensure that the CRERRFLG bit in the CECFLG register becomes 0
(no reception error detected) ).
(1) Set the CRXDEN bit in the CECC3 register to 0 (reception disabled)
(2) Wait for one or more cycles of the count source
(3) Read the CRERRFLG bit in the CECFLG register.
REJ09B0484-0030 Rev.0.30 Sep 09, 2008
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