Mitsubishi Electric M32R Series User Manual page 709

Mitsubishi 32-bit risc single-chip microcomputers

Table of Contents

The RTD communication for a fixed length of 32 bits per frame generally is performed in four

operations sending 8 bits at a time, because most serial interfaces transfer data in units of 8 bits.

The RTDACK signal is used to verify that communication is performed normally.

After transmitting a command, the RTDACK signal is pulled low, making it possible to verify the

communication status. When issuing the VER command, the RTDACK signal goes low for only one

clock period. Therefore, after sending 32 bits in one frame, turn off RTDCLK output and check

whether RTDACK is low. If RTDACK is low, you know that the RTD is communicating normally.

If you want to identify the type of transmitted command by the width of RTDACK, use the 32170's

internal measurement timer (to count RTDCLK pulses while RTDACK is low) or create a dedicated

Figure 14.4.2 Typical Operation for Communication with the Host (when Issuing VER Command)

Transfer of 1 frame (32 bits)

REAL-TIME DEBUGGER (RTD)

14.4 Typical Connection with the Host

Check the RTDACK signal L level.