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參數(shù)資料
| 型號(hào)： | EM6821TQ52B |
| 英文描述： | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: 0°C to 70°C; Package: 8-EPSOIC |
| 中文描述： | 微控制器 |
| 文件頁數(shù)： | 56/69頁 |
| 文件大?。?/td> | 852K |
| 代理商： | EM6821TQ52B |
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EM6821
10/01, Revision A/386
Copyright
2001, EM Microelectronic-Marin SA
6
www.emmicroelectronic.com
2. Operating Modes
The EM6821 has two low power dissipation modes, standby and sleep.
Figure 4 is a transition diagram for
these modes.
2.1 Active Mode
The active mode is the actual CPU running mode. Instructions are read from the internal ROM and executed by
the CPU. Leaving active mode via the halt instruction to go into standby mode, the Sleep bit write to go into
Sleep mode or a reset from port A to go into reset mode.
2.2 Standby Mode
Executing a halt instruction puts the EM6821
into standby mode. The voltage regulator,
oscillator, watchdog timer, LCD, interrupts,
timers and counters are operating. However,
the CPU stops since the clock related to
instruction execution stops. Registers, RAM
and I/O pins retain their states prior to
standby mode. A reset or an interrupt request
if enabled cancels standby.
2.3 Sleep Mode
Writing to the Sleep bit in the RegSysCntl1
register puts the EM6821 in sleep mode. The
oscillator stops and most functions of the
EM6821 are inactive. To be able to write to
the
Sleep
bit,
the
SleepEn
bit
in
RegSysCntl2 must first be set to "1". In
sleep mode only the voltage regulator and the reset input are active. The RAM data integrity is maintained.
Sleep mode may be canceled only by a high level of min 10s at the EM6821 Reset terminal or by the selected
port A input reset combination, if option InpResSleep is turned on.
Due to the cold-start characteristics of the oscillator, waking up from sleep mode may take some time to
guarantee stable oscillation. During sleep mode and the following start up the EM6821 is in reset state. Waking
up from sleep clears the Sleep flag but not the SleepEn bit. Inspecting the SleepEn allows to determine if the
EM6821 was powered up (SleepEn = "0") or woken up from sleep (SleepEn = "1").
Table 2.3.1. Internal State in Standby and Sleep Mode
Function
Standby
Sleep
Oscillator
Active
Stopped
Oscillator Watchdog
Active
Stopped
Instruction Execution
Stopped
Interrupt Functions
Active
Stopped
Registers and Flags
Retained
Reset
RAM Data
Retained
Option Registers
Retained
Timer & Counter
Active
Reset
Logic Watchdog
Active
Reset
I/O Port B and Serial Port
Active
High Impedance,
Pull’s as defined in option register
Input Port A
Active
No pull-downs and inputs deactivated
except if InpResSleep = "1"
LCD
Active
Stopped (display off)
Strobe Output
Active
Buzzer Output
Active
High Impedance
Voltage Level Detector
Finishes ongoing measure, then stop
Stopped
Reset Pin
Active
Figure 4 Mode transition diagram
Active
Halt
instruction
Sleep bit
write
IRQ
Standby
Sleep
Reset=1
Reset=0
Reset=1
Reset
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