HMS81C2012A Datasheet, PDF (80/107 Pages) List of Unclassifed Manufacturers – CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver

HMS81C2012A/2020A
17.1 Operating Mode
fXI : Main clock frequency
fSXI : sub clock frequency
fSYS : fXI,fXI÷4,fXI÷8,fXI÷32
fSUB : fSXI,fSXI÷4,fSXI÷8,fSXI÷32
cpu : system clock
tmr : timer0 clock
peri : peripheral clock
CKCTLR = CKCTLR[6:5]
SUB-ACTIVE Mode
SCMR.1 = 1
SCMR.0 = 0/1
fXI : stop
fSXI : oscillation
cpu : fSUB
tmr : fSUB
peri : fSUB
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
10 : fXI ÷ 8
01 : fXI ÷ 4 11 : fXI ÷ 32
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
76
SEP. 2004 Ver 2.00