AN2695

Peripherals partly supported by the emulators

5/13

2.1.3

ADC power consumption control

Description: the ST10F276Z5 ADC can be shut off to further optimize power consumption.

This is done through the ADCON.6 (ADOFF) bit. This bit is not supported by the ST10 bond-

out. Application software should only write to this bit and not check it.

Software impact: no impact if ST’s advice is implemented.

Hardware impact: no impact.

ST10F276Z5 emulation impact: no impact if ST’s advice is implemented.

2.2

Real-time clock

Description: an external oscillator is required for the RTC clock of the ST10F276Z5

emulators because the low-power oscillator used to clock the ST10F276Z5 RTC is not

supported by the emulators.

Also, as the ST10F276Z5 in emulation mode cannot know if the bond-out is executing a

power-down instruction, the RTCCON.7 (RTOFF) bit cannot be emulated, only the default

value’0’ (RTC keeps running during power-down) can be supported.

Partial implementations: some emulators do not gate the RTC clock to block it when the

emulation is stopped. Some emulators also do not decode the RTCCON.8 (OSC) and

RTCCON.9 (OFF32) bits. Please, contact your emulator provider to have more information

on the RTC support.

Software impact: no impact for the Idle mode. For power-down, please refer to the

documentation given by the emulator supplier.

Hardware impact: external crystals for RTC are not supported. An external oscillator is

required to supply the emulator RTC input clock.

ST10F276Z5 emulation impact: no impact in Idle mode if ST’s advice is implemented. For

power-down, please refer to the documentation given by the emulator supplier.

2.3

Standby RAM

Description: the contents of the ST10F276Z5 standby RAM are not lost when the main

supply is switched off. If the standby supply is switched off while the circuit has no main

supply, the standby RAM contents are lost. ST10F276Z5 emulators do not support the

standby pin and their supply is different from the application supply (ST10 bond-out is still

supplied if main application is switched off).

Software impact: no impact.

Hardware impact: standby functionality pin is not fully supported.

ST10F276Z5 emulation impact: the main functionality of the standby RAM is emulated.

The ST10 bond-out memory contents are kept when the main supply is switched off but the

standby RAM functionality is not fully supported. The RAM contents are not lost when the

main and standby supplies of the application are switched off.