GMS90C320

10

OCT. 2000 Ver 1.2

Special Function Registers

All registers, except the program counter and the four general purpose register banks, reside in the special function register

area.

The 27 special function registers (SFR) include pointers and registers that provide an interface between the CPU and the other

on-chip peripherals. There are also 128 directly addressable bits within the SFR area.

All SFRs are listed in Table 1, Table 2,and Table 3.

In Table 1 they are organized in numeric order of their addresses. In Table 2 they are organized in groups which refer to the

functional blocks of the GMS90C320. Table 3 illustrates the contents of the SFRs.

Table 1

Special Function Registers in Numeric Order of their Addresses

Address

Register

Contents after

Reset

Address

Register

Contents after

Reset

SP

DPL

DPH

reserved

reserved

reserved

PCON

1)

: Bit-addressable Special Function Register

2)

: X means that the value is indeterminate and the location is reserved

P21)

reserved

reserved

reserved

reserved

reserved

reserved

reserved

TCON1)

TMOD

TL0

TL1

TH0

TH1

reserved

reserved

IE1)

reserved

reserved

reserved

reserved

reserved

reserved

reserved

P11)

reserved

reserved

reserved

reserved

reserved

reserved

reserved

P31)

reserved

reserved

reserved

reserved

reserved

reserved

reserved

SCON1)

SBUF

reserved

reserved

reserved

reserved

reserved

reserved

IP1)

reserved

reserved

reserved

reserved

reserved

reserved

reserved