Target System Design - Renesas QB-MINI2 User Manual

6.1 Target System Design

This section describes the target system circuit design required for on-chip debugging and flash programming.
Figure 6-1 presents an overview of the MINICUBE2 communication interface.
figure, MINICUBE2 performs serial communication with the target device on the target system.
communication, communication circuits must be mounted on the target system.
circuits appropriately.
Target device Target device
Target system Target system
Note 1-wire mode: Single-wire UART communication using TOOL0 pin
<R> For serial communication, 1-wire mode (single-wire UART communication) using the TOOL0 pin, or 2-wire mode
using the TOOL0 and TOOL1 pins is used. Use 1-wire mode when performing flash programming.
or 2-wire mode when performing on-chip debugging. Differences between 1-wire mode and 2-wire mode are as
shown below. There are no functional differences.
<R>
Communication
1-wire mode
2-wire mode
CHAPTER 6 HOW TO USE MINICUBE2 WITH 78K0R MICROCONTROLLER
Figure 6-1.
Single-wire UART communication Single-wire UART communication
(1-wire/2-wire mode) (1-wire/2-wire mode)
Note Note
2-wire mode: Single-wire UART communication using TOOL0 and TOOL1 pins
Table 6-1. Differences Between 1-Wire Mode and 2-Wire Mode
During Flash
Mode Programming
No differences
Outline of Communication Interface
Communication circuits Communication circuits
must be mounted on must be mounted on
the target system. the target system.
USB USB
communication communication
MINICUBE2 MINICUBE2
• User resources secured for debugging
Internal ROM: 1036 bytes
Internal RAM: 6 bytes (stack)
• User resources secured for debugging
Internal ROM: 100 bytes
Internal RAM: 6 bytes (stack)
User's Manual U18371EJ5V0UM
As shown on the left side of the
Refer to this section to design
Host machine Host machine
Use 1-wire mode
During Debugging
For this
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