CDC3205G-C Micronas, CDC3205G-C Datasheet - Page 69

• 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

PRELIMINARY DATA SHEET
7. Power Saving Module (PSM)
To further reduce the power consumption one of three power
saving modes (WAKE, STANDBY and IDLE) can be
selected. Non-power saving modes are the CPU-Active
modes (DEEP SLOW, SLOW, FAST and PLL). Most of the
core logic is switched off in a power saving mode. Only HW
necessary for wake-up (and RAM and port logic in IDLE
mode) is supplied.
Fig. 7–1:
The major task of the Power Saving Module, as shown in fig-
ure 7–1, is to supply a wake-up signal (WAKE_RES) for the
main system. This signal is necessary to get the IC out of a
power saving mode which otherwise can’t be left by any
reset signal with exception of pin RESETQ. For that purpose
it combines an RTC Module for cyclic wake-up and a Port
Wake Module for event driven wake-up.
The Power Saving Module is active all the time, during power
saving modes as well as during non power saving modes
(CPU active modes). The WAKE_RES output signal can be
generated during power saving modes only.
The RTC Module has to provide the time of the day accurate
to a second and generate an output signal, that can be used
to trigger an interrupt or a wake-up signal. The RTC Module
can be clocked by an external quartz oscillator or by a build-
in RC oscillator.
The Polling Module cyclically outputs a high pulse of pro-
grammable duration at port H0.2. Some of the RTC Module
taps are connected to the Polling Module for deriving the
pulse period and duration.
The Port Wake Module merges several Wake Ports and out-
puts a signal that can be used to trigger an interrupt or a
wake-up signal.
Micronas
Wake
Up to
Ports
4/5MHz
ten
Context Diagram
20..50kHz
Oscillator
RC
Module
Module
Module
Polling
Wake
RTC
Port
June 12, 2003; 6251-579-1PD
1
enable
&
Features
– Power reduction down to 50 uA possible
– Real Time Clock (RTC) Module
– Clock source: Built in RC oscillator or XTAL
– Up to 10 edge and level triggered Wake Ports
– Wake sources: RTC Module and/or Wake Ports
– Polling Module for cyclic scan of the Wake Ports
– Interrupt outputs of RTC Module and Port Wake Module
WAKE_RES
H0.2
ISN WAPI
ISN RTC
Logic
Core
ICU
ICU
CDC 32xxG-C
Sections
Analog
AVDD,
UVDD
Reset
Logic
67