GMS81C2020 Datasheet, PDF (74/92 Pages) Hynix Semiconductor – CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver

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