Special Function Registers; Table 9.2. Special Function Register (Sfr) Memory Map - Silicon Laboratories C8051F341 Product Manual

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D

9.2.6. 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 9.2 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 9.3,
for a detailed description of each register.

Table 9.2. Special Function Register (SFR) Memory Map

F8 SPI0CN PCA0L
F0 B P0MDIN
E8 ADC0CN PCA0CPL1 PCA0CPH1 PCA0CPL2 PCA0CPH2 PCA0CPL3 PCA0CPH3
E0 ACC XBR0
D8 PCA0CN PCA0MD PCA0CPM0 PCA0CPM1 PCA0CPM2 PCA0CPM3 PCA0CPM4
D0 PSW REF0CN
C8 TMR2CN REG0CN
C0 SMB0CN SMB0CF
B8 IP CLKMUL
B0 P3 OSCXCN
A8 IE CLKSEL
A0 P2 SPI0CFG
98 SCON0 SBUF0
90 P1 TMR3CN
88 TCON TMOD
80 P0 SP
0(8) 1(9)
(bit addressable)
82
PCA0H PCA0CPL0 PCA0CPH0 PCA0CPL4 PCA0CPH4 VDM0CN
P1MDIN P2MDIN
XBR1 XBR2
SCON1 SBUF1
TMR2RLL TMR2RLH
SMB0DAT ADC0GTL ADC0GTH
AMX0N AMX0P
OSCICN OSCICL
EMI0CN -
SPI0CKR SPI0DAT
CPT1CN CPT0CN
TMR3RLL TMR3RLH
TL0 TL1
DPL DPH
2(A) 3(B)
Rev. 1.3
P3MDIN P4MDIN
IT01CF SMOD1
P0SKIP P1SKIP
TMR2L TMR2H
ADC0LTL
ADC0CF ADC0L
SBRLL1 SBRLH1
SBCON1 -
P0MDOUT P1MDOUT P2MDOUT P3MDOUT
CPT1MD CPT0MD
TMR3L TMR3H
TH0 TH1
EMI0TC EMI0CF
4(C) 5(D)
EIP1 EIP2
RSTSRC
EIE1 EIE2
P3SKIP
P2SKIP USB0XCN
- -
ADC0LTH P4
ADC0H -
FLSCL FLKEY
P4MDOUT PFE0CN
CPT1MX CPT0MX
USB0ADR USB0DAT
CKCON PSCTL
OSCLCN PCON
6(E) 7(F)