Data Sheet

8. BOOT MODE(download firmware).

8-1. Boot Mode Pins

The Module has a boot mode to program the internal flash memory.

Boot mode will be activated by setting BOOT pin to “Low” level at reset timing.

(Normal operation mode is “High” level)

Boot mode supports either UART boot or SPI boot.

UART booting uses the TXD10/RXD10 ports, and SPI booting uses the

MOSI10/MISO10/SCK10/SS10 ports.

The following pins are used in boot mode.

Table : Boot mode pin list

Block Pin Name Dir Description

SYSTEM nRESET I Reset Input signal

BOOT/PB3 I ‘0’ to enter Boot mode

UART mode of

USART10

RXD10/PB1 I UART Boot Receive Data

TXD10/PB0 O UART Boot Transmit Data

SPI mode of

USART10

SS10/PB3 I SPI Boot Slave Selectable after Boot ROM

SCK10/PB2 I SPI Boot Clock Input

MISO10/PB1 I SPI Boot Data Input with function exchange

MOSI10/PB0 O SPI Boot Data Output with function exchange

8-2. Boot Mode Connections

User can design target board using any of boot mode ports – UART or SPI mode of USART10.

The following diagrams are some examples of connection diagrams in the boot mode.