D17133CS datasheet(253/289 Pages) NEC

253 / 289 page

CHAPTER 18

INSTRUCTION SET

238

(12) PUT p, DBF

Put data buffer to peripheral

<1> OP code

00111

1010

<2> Function

(p)

← DBF

Stores the data buffer DBF contents to peripheral register.

<3> Example

Sets 0AH and 05H to data buffers DBF1 and DBF0, respectively, and transfers them to a peripheral register,

shift register (SIOSFR) for serial interface:

MOV

BANK,

#00H

; Data memory bank 0

MOV

DBF0,

#05H

MOV

DBF1,

#0AH

PUT

SIOSFR

DBF

<4> Note

Up to 16 bits in the data buffer are available. When a peripheral circuit is accessed by the PUT instruction,

the number of bits, by which the circuit is to be accessed, differs depending on the circuit. For example,

if the PUT instruction is executed to access the shift register SIO, which should be accessed in 8-bits units,

only the lower 8 bits for the data buffer DBF (DBF1, DBF0) are transferred (DBF3 and DBF2 are not

transferred).

Bank 0

Column address

System register

DBF

Peripheral

circit

0A5H

SIOSFR

D17133CS Datasheet(PDF) 253 Page - NEC

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