NEC 78K0 User Manual page 317

(3) Example of setting baud rate
Baud Rate f = 10.0 MHz
X
[bps]
TPS01, k
TPS00
− −
2400
− −
4800
9600 3 16
10400 3 15
19200 3 8
31250 2 20
38400 2 16
76800 2 8
115200 1 22
153600 1 16
230400 1 11
Remark TPS01, TPS00: Bits 7 and 6 of baud rate generator control register 0 (BRGC0) (setting of base clock
k:
f :
X
ERR:
CHAPTER 14 SERIAL INTERFACE UART0
Table 14-4. Set Data of Baud Rate Generator
Calculated ERR[%] TPS01,
Value TPS00
− − −
− −
3
9766 1.73 3
10417 0.16 3
19531 1.73 2
31250 0 2
39063 1.73 2
78125 1.73 1
−1.36
113636 1
156250 1.73 1
−1.36
227273 1
(f ))
XCLK0
Value set by the MDL04 to MDL00 bits of BRGC0 (k = 8, 9, 10, ..., 31)
X1 input clock oscillation frequency
Baud rate error
User's Manual U15947EJ2V0UD
f = 8.38 MHz
X
k Calculated ERR[%]
Value
− − −
27 4850 1.03
−2.58
14 9353
−3.15
13 10072
27 19398 1.03
−1.41
17 30809
−2.58
14 38796
27 77593 1.03
18 116389 1.03
−2.58
14 149643
9 232778 1.03
*
f = 4.19 MHz
X
TPS01, k Calculated ERR[%]
TPS00 Value
3 27 2425
3 14 4676
2 27 9699
2 25 10475
2 14 18705
− − −
2 27 38796
1 14 74821
1 9 116389
− − −
− − −
1.03
−2.58
1.03
0.72
−2.58
−
1.03
−2.58
1.03
−
−
317