UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 106

• Manufacturer Part Number: UPD784026
• Description: 16/8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

3.9 SPECIAL FUNCTION REGISTERS (SFRS)
registers, etc. They are mapped onto the 256-byte space from 0FF00H to 0FFFFH*.
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These are registers to which a special function is assigned, such as internal peripheral hardware mode registers, control
* When the LOCATION 0 instruction is executed. When the LOCATION 0FH instruction is executed, the area is FFF00H
Caution Addresses onto which SFRs are not assigned should not be accessed in this area. If such an address is
A list of special function registers (SFRs) is given in Table 3-5. The meaning of the items in the table is as explained below.
• Symbol ............................... Symbol that indicates the incorporated SFR. This is a reserved word in the NEC assembler
• R/W .................................... Indicates whether the corresponding SFR is read/write enabled.
• Manipulable Bit Units ......... Indicates the applicable manipulation bit units when the corresponding SFR is manipulated.
• On Reset ............................ Indicates the status of the register after RESET input.
to FFFFFH.
as accessed by mistake, the PD784026 may become deadlocked. A deadlock can only be released by
reset input.
(RA78K4). With the C compiler (CC78K4), this symbol can be used as an sfr variable by
means of a #pragma sfr command.
A 16-bit-manipulable SFR can be written in the operand “sfrp”, and when specified by an
address, an even address is specified.
A bit-manipulable SFR can be written in a bit manipulation instruction.
R/W: Read/write enabled
R
W
: Read-only
: Write-only
CHAPTER 3 CPU ARCHITECTURE