UPSD3422 datasheet(31/293 Pages) STMICROELECTRONICS

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uPSD34xx

Special function registers (SFR)

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Special function registers (SFR)

A group of registers designated as Special Function Register (SFR) is shown in Table 5 on

page 32. SFRs control the operating modes of the MCU core and also control the peripheral

interfaces and I/O pins on the MCU Module. The SFRs can be accessed only by using the

Direct Addressing method within the address range from 80h to FFh of internal 8032 SRAM.

Sixteen addresses in SFR address space are both byte- and bit-addressable. The bit-

addressable SFRs are noted in Table 5.

106 of a possible 128 SFR addresses are occupied. The remaining unoccupied SFR

addresses (designated as “RESERVED” in Table 5) should not be written. Reading

unoccupied locations will return an undefined value.

Note:

There is a separate set of control registers for the PSD Module, designated as csiop, and

they are described in the Section 28: PSD module on page 185. The I/O pins, PLD, and

other functions on the PSD Module are NOT controlled by SFRs.

SFRs are categorized as follows:

●

MCU core registers:

IP, A, B, PSW, SP, DPTL, DPTH, DPTC, DPTM

●

MCU Module I/O Port registers:

P1, P3, P4, P1SFS0, P1SFS1, P3SFS, P4SFS0, P4SFS1

●

Standard 8032 Timer registers

TCON, TMOD, T2CON, TH0, TH1, TH2, TL0, TL1, TL2, RCAP2L, RCAP2H

●

Standard Serial Interfaces (UART)

SCON0, SBUF0, SCON1, SBUF1

●

Power, clock, and bus timing registers

PCON, CCON0, CCON1, BUSCON

●

Hardware watchdog timer registers

WDKEY, WDRST

●

Interrupt system registers

IP, IPA, IE, IEA

●

Prog. Counter Array (PCA) control registers

PCACL0, PCACH0, PCACON0, PCASTA, PCACL1, PCACH1, PCACON1, CCON2,

CCON3

●

PCA capture/compare and PWM registers

CAPCOML0, CAPCOMH0, TCMMODE0, CAPCOML1, CAPCOMH1, TCMMODE2,

CAPCOML2, CAPCOMH2, TCMMODE2, CAPCOML3, CAPCOMH3, TCMMODE3,

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