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R01UH0336EJ0102 Rev.1.02
Page 265 of 1538
Jul 17, 2014
V850E2/PG4-L
Section 7 Clock Generation
Caution 1.
Only write to the bits BRGA0CTL.BRGA0ODIS, BRGA0CTL.BRGA0CCS[1:0]
and BRGA0CMP.BRGA0CMP[7:0] while the baud-rate counter is stopped
(BRGA0FLG.BRGA0CEF = 0). Only reading is possible while the baud-rate
generator is operating. The level of the CLKOUT signal and timing of
INTBRG0 interrupts become undefined if settings are modified during
operations.
Caution 2. To restart the baud-rate counter after it has stopped, read the
BRGA0FLG.BRGA0CEF bit and confirm that the baud-rate counter is stopped
(BRGA0FLG.BRGA0CEF = 0).
The level of the CLKOUT signal and timing of INTBRG0 interrupts become
undefined when the setting of the BRGA0CTL.BRGA0CE bit is 0 and 1 is
written to BRGA0CTL.BRGA0CE bit while the baud-rate counter is not stopped
(BRGA0FLG.BRGA0CEF = 1).
Caution 3. BRGA0CTL.BRGA0CE is synchronized with BRGA0TCLK, so synchronization
requires 3 clock cycles of BRGA0TCLK. For this reason, CLKOUT and the
INTBRG0 interrupt are initialized (both signals are fixed to the low level) after 3
cycles of BRGA0TCLK by writing 0 to BRGA0CTL.BRGA0CE bit during
operations, which stops the baud-rate counter. For the states of operation of
the baud-rate counter, refer to the description of the BRGA0FLG.BRGA0CEF
bit.
Содержание V850 Series
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