UPD17P136ACT datasheet(98/292 Pages) NEC

98 / 292 page

CHAPTER 10 DATA BUFFER (DBF)

10.2.1 Data Buffer and Peripheral Hardware

Table 10-1 shows data transfer with peripheral hardware using the data buffer.

Each unit of peripheral hardware has an individual address (called its peripheral address). By using this peripheral

address and the dedicated instructions GET and PUT, data can be transferred between each unit of peripheral

hardware and the data buffer.

GET DBF, p: Read the data in the peripheral hardware address specified by p into the data buffer (DBF).

PUT p, DBF: Write the data in the data buffer to the peripheral hardware address specified by p.

There are three types of peripheral hardware units: read/write (PUT/GET), write-only (PUT) and read-only (GET).

The following describes what happens when a GET instruction is used with write-only hardware (PUT only) and

when a PUT instruction is used with read-only hardware (GET only).

•

Reading (GET) from write-only (PUT only) peripheral hardware will yield an undefined value.

•

Writing (PUT) to read-only (GET only) peripheral hardware has no effect (same as a NOP instruction).

Table 10-1. Peripheral Hardware

(1) Peripheral hardware with input/output in 8-bit units

Peripheral

Name

Peripheral hardware

Direction of data

Actual

address

PUT

GET

bit length

01H

SIOSFR

Serial interface

8 bits

02H

TM0M

Timer 0

8 bits

03H

TM1M

Timer 1

8 bits

04H

ADCR

A/D converter

8 bits

(2) Peripheral hardware with input/output in 16-bit units

Peripheral

Name

Peripheral hardware

Direction of data

Actual

address

PUT

GET

bit length

40H

Address register

10/11 bitsNote

45H

TM0TM1C

Timer 0/timer 1 count register

16 bits

Note

10 bits for the

µPD17134A and 17135A, and 11 bits for the µPD17136A and 17137A.

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