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D17133CS Datasheet

  • D17133CS

  • 4-BIT SINGLE-CHIP MICROCONTROLLER

  • 289頁

  • NEC   NEC

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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).
鈥?Reading (GET) from write-only (PUT only) peripheral hardware will yield an unpredictable value.
鈥?Writing (PUT) to read-only (GET only) peripheral hardware has no effect (regarded as a NOP instruction).
Table 10-1. Peripheral Hardware
(1) Peripheral hardware with input/output in 8-bit units
Peripheral
Address
01H
02H
03H
SIOSFR
TMC
TMM
Shift register
Timer count register
Timer modulo register
Direction of Data
Name
Peripheral Hardware
PUT
q
脳
q
GET
q
q
脳
Effective Bit
Length
8 bits
8 bits
8 bits
(2) Peripheral hardware with input/output in 16-bit units
Peripheral
Address
40H
AR
Address register
Direction of Data
Name
Peripheral Hardware
PUT
q
GET
q
Effective Bit
Length
10 bits
81

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