Flash Programming Connection; Overview; Serial Programming Via Uart0 - Cypress FR81S CY91F52 Series Recommendation For Hardware Setup

5

Flash Programming Connection

This chapter shows which connections are needed for programming.
5.1

Overview

There are three different ways of programming the internal flash memory of this series.
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Serial programming via Uart0

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Serial programming via MDI interface
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Parallel programming interface.
5.2 Serial programming via UART0
In order to program the internal memory flash of the MCU via Uart0, the only needed part is a cable to connect the PC
with the MCU Usart0 module, to achieve that nowadays you can do it in different ways; using a regular serial cable if a
DB9 serial connector is present in the computer or using a more modern USB cable (i.e. FTDI: TTL-232R
http://www.ftdichip.com/Products/Cables/USBTTLSerial.htm). With the USB cable the achieved baud rate is higher due
to the higher speed of USB communication.
Figure 30. Principal Schematic for serial programming via Usart0 (with USB Cable)
FTDI: TTL-232R
To enable the serial programming using this method, you have to configure the Mode pins in an appropriate way (see
Figure 30) according to the Table 3.
www.cypress.com
USB TTL-232R
Document No. 002-09375 Rev. *B
Recommendation for Hardware Setup 32-Bit FR81S Family
5V
Vcc
AVcc
AVRH
AVss/AVRL
SOT0_0
SIN0_0
X0A
12p
RSTX
CY91F52x
MB91F52x
12p
X1A
X0
10p
NMIX
10p P006
MD0
X1
MD1
VSS C
4u7
2k
1n RESET
5V 5V
25