C8051F326 Datasheet, PDF(45/140 Page) List of Unclassifed Manufacturers

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C8051F326 Datasheet, PDF (45/140 Pages) List of Unclassifed Manufacturers – Full Speed USB, 16 kB Flash MCU Family

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C8051F326/7

6.2.6. Special Function Registers

The direct-access data memory locations from 0x80 to 0xFF constitute the special function registers

(SFRs). The SFRs provide control and data exchange with the CIP-51's resources and peripherals. The

CIP-51 duplicates the SFRs found in a typical 8051 implementation as well as implementing additional

SFRs used to configure and access the sub-systems unique to the MCU. This allows the addition of new

functionality while retaining compatibility with the MCS-51â¢ instruction set. Table 6.2 lists the SFRs imple-

mented in the CIP-51 System Controller.

The SFR registers are accessed anytime the direct addressing mode is used to access memory locations

from 0x80 to 0xFF. SFRs with addresses ending in 0x0 or 0x8 (e.g., P0, TCON, SCON0, IE, etc.) are bit-

addressable as well as byte-addressable. All other SFRs are byte-addressable only. Unoccupied

addresses in the SFR space are reserved for future use. Accessing these areas will have an indeterminate

effect and should be avoided. Refer to the corresponding pages of the data sheet, as indicated in

Table 6.3, for a detailed description of each register.

Table 6.2. Special Function Register (SFR) Memory Map

E0 ACC

D0 PSW

REG0CN

B0 P3

CLKMUL

CLKSEL

A0 P2

98 SCON0

SBUF0

88 TCON

80 P0

0(8)

SBCON0

TMOD

1(9)

(bit addressable)

GPIOCN

OSCICN

EMI0CN

SMOD0

TL0

DPL

2(A)

OSCLCN

OSCICL

P0MDOUT

SBRLL0

TL1

DPH

3(B)

SBRLH0

TH0

4(C)

TH1

5(D)

EIP1

EIE1

VDM0CN

EIP2

RSTSRC

EIE2

USB0XCN

FLSCL

FLKEY

P2MDOUT P3MDOUT

USB0ADR

CKCON

6(E)

USB0DAT

PSCTL

PCON

7(F)

Table 6.3. Special Function Registers

SFRs are listed in alphabetical order. All undefined SFR locations are reserved.

Description

ACC

0xE0

Accumulator

0xF0

B Register

CKCON

0x8E

Clock Control

CLKMUL

0x91

Clock Multiplier

CLKSEL

0xA9

Clock Select

DPH

0x83

Data Pointer High

DPL

0x82

Data Pointer Low

Page

135

Rev. 0.5

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