R01UH0822EJ0100 Rev.1.00
Page 949 of 1041
Jul 31, 2019
RX13T Group
31. Flash Memory (FLASH)
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).
shows an Example of Pin Connections in Boot Mode (SCI Interface).
Boot Mode (SCI Interface).
An example of pin connections shown in
is a simplified circuit. Operations are not guaranteed in all
systems.
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
I/O
Function
VCC, VSS
Power supply
—
Input 2.7 V or higher to the VCC pin.
Input 0 V to the VSS pin.
VCL
Decoupling capacitor connect
pin
—
Connect to the VSS pin via a decoupling capacitor for stabilizing
the internal voltage.
MD
Operating mode control
Input
Input low.
RES#
Reset input
Input
Reset pin. Connect to the reset circuit.
PB7/RXD1
Data input RXD
Input
Input pin for serial data
PB6/TXD1
Data output TXD
Output
Output pin for serial data
MCU
VCC
RES#
TXD1
RXD1
VCL
MD
VSS
Reset circuit
(User logic)
Data input
Data output