t6020m ATMEL Corporation, t6020m Datasheet - Page 17

• Manufacturer Part Number: t6020m
• Description: Low-current Microcontroller For Watchdog Function
• Manufacturer: ATMEL Corporation

Clock Management Register (CM)
System Configuration Register (SC)
If the bit CCS = 0 in the CM-register the RC-oscillator 1 always stops.
Rev. A3, 02-Apr-01
CM:
NSTOP
CCS
CSS1
CSS0
SC: write
BOT
OS1
OS0
Mode
1
2
OS1
Not STOP peripheral clock
NSTOP = 0, stops the peripheral clock while the core is in SLEEP mode
NSTOP = 1, enables the peripheral clock while the core is in SLEEP mode
Core Clock Select
CCS = 1, the internal RC-oscillator 1 generates SYSCL
CCS = 0, an external clock source or the RC-oscillator 2 with the external resistor at OSC1
Core Speed Select 1
Core Speed Select 0
Brown-Out Threshold
BOT = 1, low brown-out voltage threshold (3.0 V)
BOT = 0, high brown-out voltage threshold (4.0 V)
Oscillator Select 1
Oscillator Select 0
1
0
CSS1
0
1
1
0
NSTOP
OS0
register
generates SYSCL dependent on the setting of OS0 and OS1 in the system configuration
BOT
Bit 3
Bit 3
1
1
Bit 2
CCS
Bit 2
–––
Input for SUBCL
CSS0
0
1
0
1
C
C
in
in
/ 16
/ 16
CSS1
Bit 1
Bit 1
OS1
Divider
16
8
4
2
CSS0
Bit 0
Bit 0
OS0
RC–oscillator 1 and external input clock
RC-oscillator 1 and RC-oscillator 2
Reset value
Note
Auxiliary register address: ’3’hex
Primary register address: ’3’hex
Selected Oscillators
Reset value: 1x11b
Reset value: 1111b
T6020M
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