GMS90X5XC Series HYUNDAI MicroElectronics
Jan. 2001 Ver 1.0 11
SPECIAL FUNCTION REGISTERSAll registers, except the program counter and the four general purpose register banks, reside in the special func-
tion register area.
The 28 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 GMS90X5XC series. Table 3 illustrates the contents of the SFRs
Table 1. Special Function Registers in Numeric Order of their Addresses (cont’d)
Address Register Contents after
Reset Address Register Contents after
Reset
80H
81H
82H
83H
84H
85H
86H
87H
P0 1)
SP
DPL
DPH
reserved
reserved
reserved
PCON
FFH
07H
00H
00H
XXH 2)
XXH 2)
XXH 2)
0XXX0000B 2)
88H
89H
8AH
8BH
8CH
8DH
8EH
8FH
TCON 1)
TMOD
TL0
TL1
TH0
TH1
AUXR0
CKCON
00H
00H
00H
00H
00H
00H
XXH 2)
XXXXXXX0B 2)
90H
91H
92H
93H
94H
95H
96H
97H
P1 1)
reserved
reserved
reserved
reserved
reserved
reserved
reserved
FFH
00H
XXH 2)
XXH 2)
XXH 2)
XXH 2)
XXH 2)
XXH 2)
98H
99H
9AH
9BH
9CH
9DH
9EH
9FH
SCON 1)
SBUF
reserved
reserved
reserved
reserved
reserved
reserved
00H
XXH 2)
XXH 2)
XXH 2)
XXH 2)
XXH 2)
XXH 2)
XXH 2)
A0H
A1H
A2H
A3H
A4H
A5H
A6H
A7H
P2 3)
reserved
reserved
reserved
reserved
reserved
reserved
reserved
FFH
XXH 2)
XXH 2)
XXH 2)
XXH 2)
XXH 2)
XXH 2)
XXH 2)
A8H
A9H
AAH
ABH
ACH
ADH
AEH
AFH
IE 1)
reserved
reserved
reserved
reserved
reserved
reserved
reserved
0X000000B 2)
XXH 2)
XXH 2)
XXH 2)
XXH 2)
XXH 2)
XXH 2)
XXH 2)
B0H
B1H
B2H
B3H
B4H
B5H
B6H
B7H
P3 1)
reserved
reserved
reserved
reserved
reserved
reserved
reserved
FFH
XXH 2)
XXH 2)
XXH 2)
XXH 2)
XXH 2)
XXH 2)
XXH 2)
B8H
B9H
BAH
BBH
BCH
BDH
BEH
BFH
IP 1)
reserved
reserved
reserved
reserved
reserved
reserved
reserved
XX000000B 2)
XXH 2)
XXH 2)
XXH 2)
XXH 2)
XXH 2)
XXH 2)
XXH 2)