Revision D MAC 1200 resting ECG analysis system 2-11
2012250-095
Functional Description: PCB Control CS_CI
The Reset Configuration defines startup conditions like boot port size and clock
generation source.
Four LEDs indicate the device status in addition to the following.
LED1: Active when a HRESET_ occurs.
LED2: Indicator for the logic supply.
LED3, LED4: Indicate internal software states.
The control register comprises device control signals to switch off the device,
control battery charging and display control signals.
The status register contains information on the device hardware configuration and
the state of the battery charge.
Real Time Clock
With software version 6, two options for the real time clock are supported. The
software checks for an external real time clock chip (X13 on PWA control). This
chip is available with Index G of PWA Control CS_CI and Index F of PWA Control
CS_C.
If the external RTC is found, it will be used for the clock function. If not, the internal
clock of the MPC855T will be used. The external RTC is more accurate than the
internal one. Both clocks are buffered by the voltage KAPWR.
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