M16C26 Datasheet, PDF (157/239 Pages) Renesas Technology Corp – 16-BIT CMOS SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/20 SERIES

Udenvdeelropment
Preliminary Specifications Rev.
Specifications in this manual are
Serial Interface Special Function
0.9
tentative
and
subject to change.
SINGLE-CHIP 16-BIT
M16C/26 Group
CMOS MICROCOMPUTER
• Clock Phase Setting
With bit 1 of UART2 special mode register 3 (addresses 036D16, 037116 and 037516) and bit 6 of
UART2 transmission-reception control register 0 (addresses 03A416, 02AC16 and 037C16), four com-
binations of transfer clock phase and polarity can be selected.
Bit 6 of UART2 transmission-reception control register 0 sets transfer clock polarity, whereas bit 1 of
U2SMR3 register sets transfer clock phase.
Transfer clock phase and polarity must be the same between the master and slave involved in the
transfer.
(a) Master (Internal Clock)
Figure 1.15.33 shows the transmission and reception timing.
(b) Slave (External Clock)
• Figure 1.15.34 shows the timing when bit 1 of address 037516)=“0”
• Figure 1.15.35 shows the timing when bit 1 of address037516)=“1”
Clock output
"H"
(CKPOL=0, CKPH=0) ^"L"
Clock output
"H"
(CKPOL=1, CKPH=0) "L"
Clock output
"H"
(CKPOL=0, CKPH=1) _"L"
Clock output
"H"
(CKPOL=1, CKPH=1) "L"
Data output timing ^"H"
"L"
Data input timing
D0
D1
D2
D3
D4
D5
D6
D7
Figure 1.15.33. The transmission and reception timing in master mode (internal clock)
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