FR Family MB91460 Series, Flash Programming, Doc. No. 002-05153 Rev. *A
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2. Background Information
This chapter gives some information for connection of the microcontroller to the PC and the internal Boot ROM of
the MCU.
2.1
Connection to PC
For serial asynchronous programming of the internal Flash, UART channel 4 is used on MB91460 series flash
devices. Therefore UART pins SIN4 (serial input) and SOT4 (serial output) have to be
connected to the PC’s
COM port via RS232 transceiver.
The figure below shows an example for this connection. You can also connect the RS232 signals DTR or RTS to
the reset input of the microcontroller for controlling the reset signal by the programmer software.
Some terminal applications also need a connection between Pin 7 (RTS) and Pin 8 (CTS) on connector side.
Figure 2-1. Example of UART Connection
Figure 2-2. RS232 Signal Connection
GND DTR RxD TxD
CTS RTS DSR
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