CONTROL REGISTERS
S3C9454B/F9454B
Table 4-1. System and Peripheral Control Registers
Register name
Timer 0 counter register
Timer 0 data register
Timer 0 control register
Clock control register
System flags register
Stack pointer register
MDS special register
Basic timer control register
Basic timer counter
Test mode control register
System mode register
Mnemonic Address & Location
RESET value (Bit)
Address R/W 7 6 5 4 3 2 1 0
T0CNT
D0H
R
00000000
T0DATA
D1H
R/W 1 1 1 1 1 1 1 1
T0CON
D2H
R/W 0 0 – – 0 – 0 0
Location D3H is not mapped
CLKCON
D4H
R/W 0 – – 0 0 – – –
FLAGS
D5H
R/W x x x x – – – –
Locations D6H–D8H are not mapped
SP
D9H
R/W x x x x x x x x
Location DAH is not mapped
MDSREG
DBH
R/W 0 0 0 0 0 0 0 0
BTCON
DCH
R/W 0 0 0 0 0 0 0 0
BTCNT
DDH
R
00000000
FTSTCON
DEH
W
––000000
SYM
DFH
R/W – – – – – 0 0 0
NOTES:
1. – : Not mapped or not used, x: Undefined
2. The factory test mode register, FTSTCON, is for factory use only. Its value should always be '00H' during the normal
operation.
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