PM0064

Hardware interface

Doc ID 16274 Rev 3

3/13

2

Hardware interface

This section provides information on the hardware interface used to program the OTP

options. For detailed information on other aspects of the device please refer to the

STM8T141 datasheet.

2.1

External components

The STM8T141 has an internal voltage regulator that needs an external capacitor on the

VREG pin to function correctly. For a cleaner external supply a 1µF capacitor and a ceramic

100 pF capacitor between VREG & VSS is also recommended. It is recommended to place

a 1 µF capacitor between VDD and VSS.

Note:

The VREG capacitors should be placed as close as possible to the VREG & VSS pins of the

STM8T141.

Figure 1.

External components and communication lines

2.2

Communication lines

The following lines are used for programming the device:

●

CS: programming mode entry CLK and programming state SELECT

●

CX: programming mode CLK

●

POUT: programming mode DATA (bi-directional, i.e. input and output)

DD