TMPM330 - Keil

• Example baud rate setting:
Under development
1) Division by an integer (divide by N):
TMPM330 (rev 0.4) 9-11
TMPM330
Selecting fc = 39.321 MHz for fperiph, setting φT0 to fperiph/16, using the baud rate
generator input clock φT1, setting the divide ratio N (SC0BRCR) = 4, and
setting SC0BRCR = “0,” the resulting baud rate in the UART mode is
calculated as follows:
* Clocking conditions System clock : High-speed (fc)
High speed clock gear : x 1 (fc)
Prescaler clock
fc/32
Baud rate = /16
4
= 39.321 × 10
: fperiph/16 (fperiph = fsys)
6 ÷ 32 ÷ 4 ÷ 16 ≒ 19200 (bps)
(Note) The divide by (N + (16-K)/16) function is inhibited and thus SC0BRADD
is ignored.
2) For divide by N + (16-K)/16 (only for UART mode):
Selecting fc = 9.6 MHz for fperiph, setting φT0 to fperiph/8, using the baud rate
generator input clock φT1, setting the divide ratio N (SC0BRCR) = 7,
setting K (SC0BRADD) = 3, and selecting SC0BRCR = 1,
the resulting baud rate is calculated as follows:
* Clocking conditions System clock : High-speed (fc)
High-speed clock gear : x 1 (fc)
Prescaler clock : fperiph/4 (fperiph = fsys)
fc/16
Baud rate =
/16
(16 - 3)
7 +
16
= 9.6 × 10 6 ÷ 16 ÷ ( 7 + 13)
÷ 16 = 4800 (bps)
16
Also, an external clock input may be used as the serial clock. The resulting baud rate
calculation is shown below:
Serial Channel (SIO)