Software and hardware requirements

AN2792

10/12

5.3

Easy programmer board

The easy programmer is based on firmware, but, to run the code, a hardware platform must

be used where the STM8A microcontroller is interfaced with a USART port, a micro SD

memory card and the easy programmer connector (see Section 5.4: Application hardware

on page 10). In this application note, the STM8A evaluation board is used as an easy

programmer board because all hardware requirements are satisfied. The USART1 is used

to transfer the data, the firmware to be downloaded in the application board microcontroller

is loaded in the Micro SD memory card (64 Mbytes), and the LCD is used to display

messages to control the flow of operations.

5.4

Application hardware

The STM8A device must be uploaded with the easy programmer connection so that data

can be transferred and stimuli sent. Figure 2 shows the easy programmer connections and

Table 3 gives a description of each of the easy programmer signals.

Figure 2.

Easy programmer connections

Table 3.

Description of the easy programmer signals

Easy programmer

STM8A application board

Pin name

Description

Pin name

Description

RX

USART receive

TX

USART transmit

TX

USART transmit

RX

USART receive

PH4

Stimulus to write option bytes

PORTx/pin

External interrupt pin which forces

option bytes to be written

GND

Ground

GND

Ground

Easy programmer

STM8A application board

PORTx

PORTH

U

S

A

R

T

U

S

A

R

T

RX

RX

TX

TX

PH4

GND

GND

Pin