Chapter 12 Registers; What Is The Function Of The Addr Register; How Are The Eccr And Erdr Registers Initialized; Can Transmission/Reception Be Temporarily Halted By Clearing The Se And Re Bits Of The Gmr Register During Transmission/Reception - NEC mPD98409 Q&A

Q.12.1

What is the function of the ADDR register?

A.12.1
The ADDR register function is invalid in the µ PD98409. An undefined value is stored in the ADDR register.
Reference: µ PD98409 User's Manual 7.2 (6) ADDR
Q.12.2

How are the ECCR and ERDR registers initialized?

A.12.2
The ECCR and ERDR registers are not initialized after a software reset. They are initialized after a hardware
reset, and their initial values are: ECCR = 0 and ERDR = undefined.
Reference: µ PD98409 User's Manual 7.2 (11) ECCR, 7.2 (12) ERDR
Q.12.3
Can transmission/reception be temporarily halted by clearing the SE and RE bits of the GMR register during
transmission/reception?
A.12.3
Yes. If the SE and RE bits are set again, transmission/reception is resumed. While the SE and RE bits are in a
cleared state, however, transmission is stopped, during which time the rate cannot be adjusted as set. On the
reception side, the cells received during this time are internally discarded.
Reference: µ PD98409 User's Manual 7.2 (1) GMR
Q.12.4

What is the value of the VER register?

A.12.4
K standard/E standard: VER = 0200h
For the other versions, consult an NEC sales representative.
Reference: µ PD98409 User's Manual 7.2 (7) VER
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CHAPTER 12 REGISTERS

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