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参数资料
| 型号： | AT89EB5114 |
| 厂商： | Atmel Corp. |
| 元件分类： | 8位微控制器 |
| 英文描述： | Low-pin-count 8-bit microcontroller with A/D converter |
| 中文描述： | 低引脚数的8 - A / D转换位微控制器 |
| 文件页数： | 19/95页 |
| 文件大小： | 1126K |
| 代理商： | AT89EB5114 |
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4311A–8051–01/05
Power Modes
Overview
As seen in the previous chapter it is possible to modify the AT8xEB5114 clock manage-
ment in order to have less consumption.
For applications where power consumption is a critical factor, three power modes are
provided:
Normal (running) mode
Idle mode
Power-down mode
In order to increase ADC accuracy, a Quiet mode also exits. This mode is a pseudo idle
mode in which the CPU and all the peripherals except the AD converter are disabled.
Power modes are controlled by PCON SFR register.
Operating Modes
Table 8 summarizes all the power modes and states that AT8xEB5114 can encounter. It
shows which parts of AT8xEB5114 are running depending on the operating mode.
Table 8.
Operating Modes
Normal Mode
In normal mode, the oscillator, the CPU and the peripherals are running. The prescaler
can also be activated.
The CPU and the peripherals clock depends on the software selection using
CKCON, OSCCON, CKSEL and CKRL registers
CKS bits select either OSCA, OSCB, or OSCC
CKRL register determines the frequency of the selected clock, unless X2 bit is set.
In this case the prescaler/divider is not used, so CPU core needs only 6-clock
periods per machine cycle.
It is always possible to switch dynamically by software from one to another oscillator by
changing CKS bits, a synchronization cell allows to avoid any spike during transition.
Idle Mode
The idle mode allows to reduce consumption by freezing the CPU. All the peripherals
continue running.
Entering Idle Mode
An instruction that sets PCON.0 causes that to be the last instruction executed before
going into Idle mode.
In Idle mode, the internal clock signal is gated off to the CPU, but not to the interrupt,
and the peripheral functions. The CPU status is entirely preserved: the Stack Pointer,
Program Counter, Program Status Word, Accumulator and all other registers maintain
Operating Mode
Prescaler
Oscillator
POR
CPU
Peripherals
Power Down
X
Under Reset
A, B or C
X
Start
X
A, B or C
X
X
Running
(X)
A, B or C
X
X
X
Idle
(X)
A, B or C
X
X
Quiet
(X)
A, B or C
X
only ADC
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