Boot Mode (Sci Interface); Operating Conditions In Boot Mode (Sci Interface) - Renesas RX100 Series User Manual

RX13T Group
31.8.1

Boot Mode (SCI Interface)

The flash memory can be programmed and erased using asynchronous serial communication in boot mode (SCI
interface). The user area and data area can be rewritten.
When a reset is released while the MD pin is low, the MCU starts in boot mode (SCI interface).
Contact the manufacturer for details on the serial programmer.
31.8.1.1

Operating Conditions in Boot Mode (SCI Interface)

SCI1 is used to communicate with the serial programmer in boot mode (SCI interface).
Figure 31.20 shows an Example of Pin Connections in Boot Mode (SCI Interface). Table 31.7 lists Pin Handling in
Boot Mode (SCI Interface).
An example of pin connections shown in Figure 31.20 is a simplified circuit. Operations are not guaranteed in all
systems.
Data input
Data output
Figure 31.20 Example of Pin Connections in Boot Mode (SCI Interface)
Table 31.7 Pin Handling in Boot Mode (SCI Interface)
Pin Name Name
VCC, VSS Power supply
VCL Decoupling capacitor connect
pin
MD Operating mode control
RES# Reset input
PB7/RXD1 Data input RXD
PB6/TXD1 Data output TXD
R01UH0822EJ0100 Rev.1.00
Jul 31, 2019
Reset circuit
RES#
(User logic)
TXD1
RXD1
MD
I/O Function
— Input 2.7 V or higher to the VCC pin.
Input 0 V to the VSS pin.
— Connect to the VSS pin via a decoupling capacitor for stabilizing
the internal voltage.
Input Input low.
Input Reset pin. Connect to the reset circuit.
Input Input pin for serial data
Output Output pin for serial data
31. Flash Memory (FLASH)
MCU
VCC
VCL
VSS
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