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SH7708 Fiches technique(PDF) 427 Page - Renesas Technology Corp

No de pièce SH7708
Description  SuperH??RISC engine
PDF  633 Pages
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Fabricant  RENESAS [Renesas Technology Corp]
Site Internet  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7708 Fiches technique(HTML) 427 Page - Renesas Technology Corp

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409
Ds
D0
D1
D2
D3
D4
D5
D6
D7
Dp
A
(Z)
Z
Z
A
Z
Z
Z
A
A
Z
(Z)
State
a. Direct convention (SDIR, SINV, and O/
E are all 0)
Ds
D7
D6
D5
D4
D3
D2
D1
D0
Dp
A
(Z)
Z
Z
A
A
A
A
A
A
Z
(Z)
State
b. Inverse convention (SDIR, SINV, and O/
E are all 1)
Figure 14.4 Waveform of Start Character
14.3.5
Clock
Only the internal clock generated by the on-chip baud rate generator can be used as the
communication clock in the smart card interface. The bit rate for the clock is set by the bit rate
register (SCBRR) and the CKS1 and CKS0 bits in the serial mode register (SCSMR), and is
calculated using the equation below. Table 14.5 shows sample bit rates. If clock output is then
selected by setting CKE0 to 1, a clock with a frequency 372 times the bit rate is output from the
SCK0 pin.
B =
× 106
1488
× 22n–1 × (N + 1)
φ
P
Where:
N = Value set in SCBRR (0
≤ N ≤ 255)
B = Bit rate (bit/s)
P
φ = Peripheral module operating frequency (MHz)*
n = 0–3 (table 14.4)



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