CDC3205G-C Micronas, CDC3205G-C Datasheet - Page 80

• Manufacturer Part Number: CDC3205G-C
• Description: Automotive Controller Family The Device is a Microcontroller For Use in Automotive Applications.the On-chip Cpu is an Arm Processor ARM7TDMI with 32-bit Data And Address Bus, Which Supports Thumb format Instructions.
• Manufacturer: Micronas

CDC 32xxG-C
PRELIMINARY DATA SHEET
the necessary Wake Out signal. The signal Wake Out is nec-
essary for a strobe pulse at the falling edge of Wake Out.
If no RTC-/Polling module is available or shall not be used,
an alternative strobe signal can be used by setting flag
WSC.AST to one. As long as WSC.AST is set and the pro-
grammed trigger level is applied to the corresponding pin,
the flag WUS.WPx is set and can’t be reset by the SW. If
more than one Wake Port is operated with the alternative
strobe signal, WPMx.MOD has to be disabled before
WUS.WPx can be cleared. Clearing WSC.AST only during
the WUS clearing procedure does not help in this case. Inter-
rupts of other Wake Ports can be lost if the high or low time is
too short.
Set WSC.AST to 1 if a Wake Port is used as CAN bus wake-
up, otherwise it is possible that a CAN telegram is strobed
always at its high level. In this case the CAN telegram can
not arouse the system.
The selected strobe signal source is valid for all Wake Ports.
Mixing of the strobe signal sources (polling and alternative)
is not possible.
If only edge triggered mode is used, the RTC Module and the
Polling Module are not necessary for correct operation of the
Port Wake Module.
7.6.4. Wake-up from Power Saving Mode
Beneath above described initialization, it is necessary to
enable the Port Wake Module as wake-up source by register
WSC flag P.
After wake-up the reason can be read in register WUS. It
should be cleared after reading it, otherwise neither wake-up
nor Wake Port interrupt via ISN WAPI is possible.
7.6.5. Wake Port Interrupt
Beneath above described initialization, the ICU and the cor-
responding ISN has to be initialized.
All Wake Ports are directed to a single ISN and interrupt vec-
tor. After an interrupt the source can be read in register
WUS. It should be cleared after reading it, otherwise no fur-
ther Wake Port interrupts via ISN WAPI are possible.
Precautions
Parallel usage of a P-Port as analog and Wake Port input is
possible but not recommended. In this case the Schmitt Trig-
ger input circuit is enabled. This is the reason why input lev-
els other than AV
and AV
may cause quiescent currents
SS
DD
in the Schmitt Trigger circuit and thus lead to higher power
consumption.
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Micronas
June 12, 2003; 6251-579-1PD