M16C26 Datasheet, PDF (151/239 Pages) Renesas Technology Corp – 16-BIT CMOS SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/20 SERIES

Udenvdeelropment
Preliminary Specifications Rev.
Specifications in this manual are
UART2 Special Mode Register 2
0.9
tentative
and
subject to change.
SINGLE-CHIP 16-BIT
M16C/26 Group
CMOS MICROCOMPUTER
UART2 Special Mode Register 2
UARTi special mode register 2 (address 037616) is used to further control UART2 in I²C mode.
Bit 0 of the UART2 special mode register 2 (address 037616) is used as the I²C mode select bit 2. Table
1.15.14 shows the types of control to be changed by I²C mode select bit 2 when the I²C mode select bit
is set to “1”. Table 1.15.15 shows the timing characteristics of detecting the start condition and the stop
condition.
Table 1.15.14. Functions changed by I²C mode select bit 2
Function
1 _{Factor of interrupt number 15}
2 Factor of interrupt number 16
3 _{DMA1 factor at the time when 1101 is}
assigned to the DMA request factor
selection bits.
4 Timing for transferring data from the
UART2 reception shift register to the
reception buffer.
5 Timing for generating a UART2
reception/ACK interrupt request
IICM2 = 0
IICM2 = 1
No acknowledgment detection (NACK)
Acknowledgment detection (ACK)
UART2 transmission (the rising edge
of the final bit of the clock)
UART2 reception (the falling edge of
the final bit of the clock)
Acknowledgment detection (ACK)
UART2 reception (the falling edge of
the final bit of the clock)
The rising edge of the final bit of the
reception clock
The falling edge of the final bit of the
reception clock
The rising edge of the final bit of the
reception clock
The falling edge of the final bit of the
reception clock
Table 1.15.15. Timing characteristics of detecting the start condition and the stop condition (Note 1)
3 to 6 cycles < duration for setting-up (Note)
3 to 6 cycles < duration for holding (Note)
Note: Cycles is in terms of the input oscillation frequency f(XIN) of the main clock.
SCL
SDA
(Start condition)
SDA
(Stop condition)
Duration for
setting up
Duration for
holding
Renesas Technology Corp.
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