Section 20 Realtime Clock (RTC)
Rev.1.00 Dec. 13, 2005 Page 730 of 1286
REJ09B0158-0100
20.5 Interrupts
There are three kinds of RTC interrupt: alarm interrupts, periodic interrupts, and carry interrupts.
An alarm interrupt request (ATI) is generated when the alarm flag (AF) in RCR1 is set to 1 while
the alarm interrupt enable bit (AIE) is also set to 1.
A periodic interrupt request (PRI) is generated when the periodic interrupt enable bits (PES2–
PES0) in RCR2 are set to a value other than 000 and the periodic interrupt flag (PEF) is set to 1.
A carry interrupt request (CUI) is generated when the carry flag (CF) in RCR1 is set to 1 while the
carry interrupt enable bit (CIE) is also set to 1.
20.6 Usage
Notes
20.6.1 Register
Initialization
After powering on and making the RCR1 register settings, reset the frequency divider (by setting
RCR2.RESET to 1) and make initial settings for all the other registers.
20.6.2 Crystal
Oscillator
Circuit
Crystal oscillator circuit constants (recommended values) are shown in table 20.4, and the RTC
crystal oscillator circuit in figure 20.5.
Table 20.4 Crystal Oscillator Circuit Constants (Recommended Values)
f
osc
C
in
C
out
32.768 kHz
10–22 pF
10–22 pF
Содержание SH7780 Series
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