UPD784936A View Datasheet(PDF) - NEC => Renesas Technology

Part Name

Description

Manufacturer

UPD784936A

16-BIT SINGLE-CHIP MICROCONTROLLERS

NEC => Renesas Technology 

µPD784935A,784936A,784937A,784938A

7.2.3 Special function registers (SFRs)

The special function registers (SFRs) are registers having a special function, such as the mode registers and control

registers of the on-chip peripheral hardware, and are mapped to a 256-byte space of addresses 0FF00H to 0FFFFHNote.

Note This is the case when the LOCATION 0H instruction is executed. They are mapped to FFF00H to FFFFFH

when the LOCATION 0FH instruction is executed.

Caution Do not access an address in this area to which no SFR is allocated. If such an address is accessed

by mistake, the µPD784938A may be deadlocked. The deadlock status can be released only by

a reset.

Table 7-1 lists the special function registers (SFRs). The meanings of the symbols in this table are as follows:

• Abbreviation .......................... Abbreviation of the SFR. This abbreviation is reserved for use with NEC’s assem-

bler (RA78K4). With the C compiler (CC78K4), this abbreviation can be used as

an sfr variable when the #pragma sfr command is used.

• R/W ....................................... Indicates whether the SFR can be read or written.

R/W: Read/Write

R: Read only

W: Write only

• Bit Units for Manipulation ..... Indicates the bit units in which the SFR can be manipulated. An SFR that can be

manipulated in 16-bit units can be written as operand sfrp. When specifying the

SFR using an address, use the even address.

An SFR that can be manipulated in 1-bit units can be written with a bit manipulation

instruction.

• After Reset ............................ Indicates the status of the register when the RESET signal is input.

Data Sheet U13572EJ2V0DS

29

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