NEC PD754144 User Manual

Page 56

CHAPTER 3 FEATURES OF ARCHITECTURE AND MEMORY MAP

User’s Manual U10676EJ3V0UM

Figure 3-7.

µPD754244 I/O Map (5/8)

Hardware name (symbol)

Number of bits that

Bit

Address

R/W

can be manipulated

manipulation

Remarks

1-bit

4-bit

8-bit

addressing

FC0H

Bit sequential buffer 0 (BSB0)

R/W

mem.bit

FC1H

Bit sequential buffer 1 (BSB1)

R/W

pmem.@L

FC2H

Bit sequential buffer 2 (BSB2)

R/W

FC3H

Bit sequential buffer 3 (BSB3)

R/W

FC4H

Unmounted

FC5H

FC6H

Reset detection flag register (RDF)

R/W

–

mem.bit

Manipulation can be performed only on bits 2 and 3.

KRF

WDF

–

FC7H

Unmounted

FCDH

FCEH

R/W

–

mem.bit

A write to an unmounted area is invalid, and

EEPROM write control register (EWC)

the read value is undefined.

FCFH

–

Notes 1.

In bit manipulation: EWE = R/W, EWST = R only, ERE = R/W.

These are not registered as reserved words.

................................................................................

EWE

Note 1

EWST

Note 1

–

ERE

Note 1

EWTC6

Note 2

EWTC5

Note 2

EWTC4

Note 2

This manual is related to the following products:

PD754244