Event Detection Function - NEC UPD703116 User Manual

32-bit single-chip microcontrollers

Table of Contents

Caution The length of the read data is fixed to 8 bits.

12.4.2 Event detection function

By having a comparator (24-bit address setting) for match detection on-chip, this function detects match of the

address setting registers shown below and outputs a match trigger (falling edge) to the NBD tool. Event trigger output

is low active and during the active period it is output synchronous with the system clock of the target CPU. The active

width is one cycle of the internal system clock of the CPU.

(1) Event detection conditions

• Execution PC address match

Match detection range for timing of a write to a set address in the internal RAM area

XFFFC000H to XFFFE7FFH

(2) Event detection function control register

(a) NBD event condition setting register (EVTU_C)

Bit position

CHAPTER 12 NBD FUNCTION (

Table 12-8. Data Packet

Selects an execution PC event or RAM access event.

0: Internal RAM access event is invalid

1: Execution PC event is invalid

If the EVTU_C register is set to a location other than the internal RAM area,

an event also is output when writing to other than the RAM.

User's Manual U14492EJ5V0UD

NBD space address

Initial value