GMS81C2020/GMS81C2120
Hyundai Micro Electronics
21.1 Operating Mode
SUB-ACTIVE Mode
SCMR.1 = 1
SCMR.0 = 0/1
fXI
: main clock frequency
fSXI : sub clock frequency
fSYS : fXI÷2,fXI÷8,fXI÷16,fXI÷64
fSUB : fSXI÷2,fSXI÷8,fSXI÷16,fSXI÷64
cpu : system clock
fXI : stop
fSXI : oscillation
cpu : fSUB
tmr : fSUB
peri : fSUB
TIMER0
EXT_INT
RESET
CKCTLR[10]
tmr : timer0 clock
+
peri : peripheral clock
STOP
RC_WDT
CKCTLR = CKCTLR[6:5]
SCMR.0 = 0
SCMR.1 = 1
+
SCMR.1 = 0
STANDBY Mode
ACTIVE Mode
WATCH Mode
CKCTLR[10]
+
SCMR.1 = 0
SCMR.1 = 0
SCMR.1 = 1
STOP
fXI : oscillation
fSXI : oscillation
cpu : stop
tmr : ps11(fXI)
peri : stop
fXI : oscillation
fSXI : oscillation
cpu : fSYS
tmr : fSYS
peri : fSYS
fXI : stop
fSXI : oscillation
cpu : stop
tmr : ps11(fSXI)
peri : stop
TIMER0
EXT_INT
RESET
RC_WDT
CKCTLR[00]
EXT_INT
RESET
+
STOP
RC_WDT
CKCTLR[00]
EXT_INT
RESET
STOP Mode
+
STOP
RC_WDT
SCMR.2 = 1
(SUB_CLK OFF)
fXI : stop
fSXI : stop
cpu : stop
tmr : stop
peri : stop
System Clock Mode Register
ADDRESS : FAH
RESET VALUE : ---00000
-
-
-
CS1
CS0
SUBOFF CLKSEL MAINOFF
SCMR
CS[1:0]
Clock selection enable bits
00 : fXI 210 : fXI 16
CLKSEL
Clock selection bit
0 : Main clock selection
1 : Sub clock selection
÷
÷
01 : fXI 811 : fXI 64
÷
÷
SUBOFF
Sub clock control bit
0: On sub clock
1: Off sub clock
MAINOFF Main clock control bit
0: On main clock
1: Off main clock
74
preliminary
Nov. 1999 Ver 0.0
HYNIX [ HYNIX SEMICONDUCTOR ]
