C8051F310 datasheet(87/228 Pages) SILABS

87 / 228 page

Rev. 1.7

C8051F310/1/2/3/4/5/6/7

8.2.6. 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-51™ instruction set. Table 8.2 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 datasheet, as indicated in Table 8.3,

for a detailed description of each register.

Table 8.2. Special Function Register (SFR) Memory Map

SPI0CN

PCA0L

PCA0H

PCA0CPL0 PCA0CPH0 PCA0CPL4 PCA0CPH4 VDM0CN

P0MDIN

P1MDIN

P2MDIN

P3MDIN

EIP1

ADC0CN PCA0CPL1 PCA0CPH1 PCA0CPL2 PCA0CPH2 PCA0CPL3 PCA0CPH3 RSTSRC

ACC

XBR0

XBR1

IT01CF

EIE1

PCA0CN

PCA0MD PCA0CPM0 PCA0CPM1 PCA0CPM2 PCA0CPM3 PCA0CPM4

PSW

REF0CN

P0SKIP

P1SKIP

P2SKIP

TMR2CN

TMR2RLL

TMR2RLH

TMR2L

TMR2H

SMB0CN

SMB0CF

SMB0DAT

ADC0GTL

ADC0GTH

ADC0LTL

ADC0LTH

AMX0N

AMX0P

ADC0CF

ADC0L

ADC0H

OSCXCN

OSCICN

OSCICL

FLSCL

FLKEY

CLKSEL

EMI0CN

SPI0CFG

SPI0CKR

SPI0DAT

P0MDOUT P1MDOUT P2MDOUT P3MDOUT

SCON0

SBUF0

CPT1CN

CPT0CN

CPT1MD

CPT0MD

CPT1MX

CPT0MX

TMR3CN

TMR3RLL

TMR3RLH

TMR3L

TMR3H

TCON

TMOD

TL0

TL1

TH0

TH1

CKCON

PSCTL

DPL

DPH

PCON

0(8)

1(9)

2(A)

3(B)

4(C)

5(D)

6(E)

7(F)

(bit addressable)

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