
CHAPTER 6 CLOCK GENERATION FUNCTION
User’s Manual U15905EJ2V1UD
209
6.5
Prescaler 3
Prescaler 3 has the following functions.
Generation of clock for count clock of watch timer (source clock: main clock oscillation)
Generation of clock for count clock of A/D converter (source clock: main clock oscillator)
Interval timer (INTBRG)
Figure 6-2. Block Diagram of Prescaler 3
Selector
fX
fX/8
fX/4
fX/2
fX
BGCS0
BGCS1
TODIS
CE
3-bit prescaler
8-bit counter
Output
control
PRSCM: PRSCM0 to PRSCM7
Match
fBGCS
fBRG
INTBRG
Prescaler mode register (WTM)
Remark
fBRG: Prescaler 3 clock frequency
fX: Main clock oscillation frequency