Renesas M16C FAMILY Hardware Manual page 53

Under development
Preliminary specification
Specifications in this manual are tentative and subject to change.
R8C/11 Group
Table 6.5 Determination of Interrupt Source (Oscillation Stop Detection or Watchdog Timer Interrupt)
Generated Interrupt Source
Oscillation stop detection
( (a) or (b) )
Watchdog timer
Voltage detection
Figure 6.8 Switching Clock Source From Low-speed Ring Oscillator to Main Clock
Rev.0.91 2003 Sep 08
(a) The OCD3 bit in the OCD register = 1
(b) The OCD1 to OCD0 bits in the OCD register = 11
The D43 bit in the D4INT register = 1
The D42 bit in the D4INT register = 1
Switch to Main clock
Verify OCD3 bit
Determine several times
Set OCD1 to OCD0 bits to 00
(oscillation stop detection function disabled)
Set OCD2 bit to 0
(selecting main clock)
page 43 of 184
Bit showing interrupt source
OCD2 bit = 1
1(main clock stop)
0(main clock oscillating)
Determine several times that the main clock is supplied
2
End
OCD3 to OCD0 bits: Bits in OCD register
6.5 Oscillation Stop Detection Function
and the
2