HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 520
HD6433044
Manufacturer Part Number
HD6433044
Description
(HD64 Series) Hitachi Single-Chip Microcomputer
Manufacturer
Hitachi Semiconductor
Datasheet
1.HD6433044.pdf
(867 pages)
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14.3.5 Clock
As its serial communication clock, the smart card interface can use only the internal clock
generated by the on-chip baud rate generator. The bit rate can be selected by setting the bit rate
register (BRR) and bits CKS1 and CKS0 in the serial mode register (SMR). The bit rate can be
calculated from the equation given below. Table 14-5 lists some examples of bit rate settings.
If bit CKE0 is set to 1, a clock signal with a frequency equal to 372 times the bit rate is output
from the SCK
B =
where, N: BRR setting (0 ≤ N ≤ 255)
Table 14-4 n-Values of CKS1 and CKS0 Settings
n
0
1
2
3
Note: * If the gear function is used to divide the system clock frequency, use the divided frequency
Table 14-5 Bit Rates (bits/s) for Different BRR Settings (when n = 0)
N
0
1
2
Note: Bit rates are rounded off to one decimal place.
1488 2
7.1424
9600.0
4800.0
3200.0
B: Bit rate (bits/s)
ø: System clock frequency (MHz)*
n: See table 14-4
to calculate the bit rate. The equation above applies directly to 1/1 frequency division.
0
2n–1
CKS1
0
0
1
1
pin.
ø
10.00
13440.9
6720.4
4480.3
(N + 1)
CKS0
0
1
0
1
10
10.7136
14400.0
7200.0
4800.0
6
13.00
17473.1
8736.6
5824.4
510
ø (MHz)
14.2848
19200.0
9600.0
6400.0
16.00
21505.4
10752.7
7168.5
18.00
24193.5
12096.8
8064.5
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