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MB90335 Series
18.6.1
Baud Rate of the UART Internal Clock Using the
Dedicated Baud Rate Generator
Indicates baud rates possible to set when selecting a dedicated baud rate generator, as
an UART transfer clock.
■ Baud Rate of the Internal Clock Using the Dedicated Baud Rate Generator
Divides the machine clock by setting the 11-bit reload value at the UART prescaler control registers 0, 1
(UTCR0, UTCR1), and the UART prescaler reload registers 0, 1 (UTRLR0, UTRLR1).
<Asynchronous mode >
BAUD RATES= φ/4n (bps)
φ: Frequency of the machine clock, n: Values of D10 to D0 (UTCR0, UTCR1, UTRLR0, UTRLR1)
However, please set neither n=1, 2 nor 3.
<Synchronous mode>
BAUD RATES = 2φ/n (bps)
φ: Frequency of the machine clock, n: values of D10 to D0 (UTCR0, UTCR1, UTRLR0, UTRLR1)
However, please set D1, D0=00
Note:
Setting "01
set bit generates the serial clock whose duty ratio is different. So set D1 and D0 (bit1 and bit0 of
UTRLR0, UTRLR1) to "00
CM44-10137-6E
when n=16 or more.
B
", "10
" and "11
" to D1 and D0 (bit1 and bit0 of UTRLR0, UTRLR1) of the basic cycle
B
B
B
" when in the clock synchronization mode.
B
FUJITSU MICROELECTRONICS LIMITED
CHAPTER 18 UART
18.6 UART Baud Rate
411
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