AN2169 datasheet(6/33 Pages) STMICROELECTRONICS

6 / 33 page

Modified features

AN2169

6/33

1.1.2

Pin 99

On the ST10F168, pin 99 is EA and used upon reset to select the start from internal flash or

external memory.

Now, on the ST10F276, it has an the additional function of providing the 5V power supply to the

device in standby mode (new power saving mode) and is therefore named EA - VSTBY.

Hardware impact

For an application not using the Stand by mode, no change is required on the PCB. However,

for the application to use it , the EA - VSTBY pin must be separated from the common 5v and

have a specific supply path.

Software impact

None.

1.1.3

Pins 143 & 144

These pins were a Vss-VDD pair in the ST10F168. Now, on the ST10F276, they are used as

XTAL3-XTAL4 pair for connection to an optional 32Khz crystal to clock the device during power-

down.

Hardware impact

PCB must be redesigned. In case the optional 32Khz is not used, XTAL3 must be linked to

ground as it was in the ST10F168 but XTAL4 shall be left open.

Software impact

In case the optional 32Khz is not used, the bit OFF32 of the RTCCON register shall be set.

Prior to setting the OFF32 bit in RTCCON register, the RTC must be enabled by setting

RTCEN, bit 4 of XPERCON, and XPEN, bit3 of SYSCON.

1.1.4

Pin 84

This pin was named Vpp/RPD on the ST10F168 and was the 12v input pin Flash programming.

In the ST10F276, it is now only used as RPD.

Hardware impact

This pin is no longer designed to accept 12V inputs. Its ratings are the same as any other pin: -

0.5V to VDD + 0.5V.

Software impact

None.

144

XTAL4

VDD Digital supply voltage

RPD

Vpp / RPD

V18 1.8v decoupling pin

VDD digital supply voltage

Pin no.

ST10F276 pin function

ST10F168 pin function

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