Chapter 12 Nbd Function; Pd70F3116); Overview - NEC UPD703116 User Manual

The V850E/IA1 provides the Non Break Debug (NBD) function for on-chip data tuning.

12.1 Overview

The NBD function encompasses the following functions.
(1) RAM monitoring function
This function makes an arbitrary RAM area readable or writable using an NBD tool via DMA.
[Corresponding RAM area]
XFFFC000H to XFFFE7FFH
If executed using an address outside the above, the function instantly returns "ready".
Output is undefined on a read, and the write operation is not performed on a write.
(2) Event detection function
By having a comparator (24-bit address setting) for match detection on-chip, this function outputs a match
trigger (falling edge) to the NBD tool when the address match detection shown below is performed. The
lower 2 bits are masked.
• Execution PC address match detection
• Internal RAM area address write timing match detection
[Detection range]
ROM: X0000000H to X003FFFFH
RAM: XFFFC000H to XFFFE7FFH
Pin Name
CLK_DBG
SYNC
AD0_DBG to AD3_DBG
TRIG_DBG

CHAPTER 12 NBD FUNCTION (

Table 12-1. NBD Block Dedicated Pin Summary
I/O
Input Serial clock input for debugging interface
Input Synchronization signal for debugging
I/O Command data and RAM data I/O (4 bits)
Output Outputs trigger (falling edge) synchronized to timing of write to arbitrary specified RAM
address or to timing of execution of instruction at specified address.
User's Manual U14492EJ5V0UD
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PD70F3116)

Function Summary
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