UPD17P133CS datasheet(95/289 Pages) NEC

95 / 289 page

CHAPTER 10

DATA BUFFER (DBF)

Figure 10-2. Data Buffer Configuration

Address

Bit

Data

DBF3

Symbol

Bit

b15 b14 b13 b12

DBF2

b11 b10

DBF1

DBF0

0CH

0DH

0EH

0FH

Data memory

BANK0

Data buffer

Data

Because the data buffer is allocated in data memory, it can be used in any of the data memory manipulation

instructions.

10.2 FUNCTIONS OF THE DATA BUFFER

The data buffer has two separate functions.

The data buffer is used for data transfer with peripheral hardware. The data buffer is also used for reading constant

data in program memory. Figure 10-3 shows the relationship between the data buffer and peripheral hardware.

Figure 10-3. Relationship Between the Data Buffer and Peripheral Hardware

01H

Shift register (SIOSFR)

Peripheral hardware

02H

03H

Timer modulo register

(TMM)

40H

Address register (AR)

Data buffer

(DBF)

Constant data

Program memory (ROM)

Internal bus

Peripheral

address

Timer count register

(TMC)

UPD17P133CS Datasheet(PDF) 95 Page - NEC

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