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参数资料
| 型号： | P89V51RD2FN,112 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 59/80页 |
| 文件大小： | 0K |
| 描述： | IC 80C51 MCU FLASH 64K 40-DIP |
| 产品培训模块： | Migrating from 8/16-Bit MCUs to 32-Bit ARMs |
| 标准包装： | 9 |
| 系列： | 89V |
| 核心处理器： | 8051 |
| 芯体尺寸： | 8-位 |
| 速度： | 40MHz |
| 连通性： | SPI，UART/USART |
| 外围设备： | 欠压检测/复位，POR，PWM，WDT |
| 输入/输出数： | 32 |
| 程序存储器容量： | 64KB（64K x 8） |
| 程序存储器类型： | 闪存 |
| RAM 容量： | 1K x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 4.5 V ~ 5.5 V |
| 振荡器型： | 内部 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 40-DIP（0.600"，15.24mm） |
| 包装： | 管件 |
| 产品目录页面： | 706 (CN2011-ZH PDF) |
| 配用： | 622-1017-ND - BOARD 44-ZIF PLCC SOCKET 622-1001-ND - USB IN-CIRCUIT PROG 80C51ISP |
| 其它名称： | 568-2431-5 935277948112 P89V51RD2FN |
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PIC18F87K22 FAMILY
DS39960D-page 62
2009-2011 Microchip Technology Inc.
4.3
Sleep Mode
The power-managed Sleep mode in the PIC18F87K22
family of devices is identical to the legacy Sleep mode
offered in all other PIC devices. It is entered by clearing
the IDLEN bit (the default state on device Reset) and
executing the SLEEP instruction. This shuts down the
selected oscillator (Figure 4-5). All clock source status
bits are cleared.
Entering Sleep mode from any other mode does not
require a clock switch. This is because no clocks are
needed once the controller has entered Sleep. If the
WDT is selected, the LF-INTOSC source will continue
to operate. If the SOSC oscillator is enabled, it will also
continue to run.
When a wake event occurs in Sleep mode (by interrupt,
Reset or WDT time-out), the device will not be clocked
until the clock source selected by the SCS<1:0> bits
becomes ready (see Figure 4-6). Alternately, the device
will be clocked from the internal oscillator block if either
the Two-Speed Start-up or the Fail-Safe Clock Monitor is
enabled (see Section 28.0 “Special Features of the
). In either case, the OSTS bit is set when the
primary clock is providing the device clocks. The IDLEN
and SCS bits are not affected by the wake-up.
4.4
Idle Modes
The Idle modes allow the controller’s CPU to be
selectively shut down while the peripherals continue to
operate. Selecting a particular Idle mode allows users
to further manage power consumption.
If the IDLEN bit is set to a ‘1’ when a SLEEP instruction is
executed, the peripherals will be clocked from the clock
source selected using the SCS<1:0> bits. The CPU,
however, will not be clocked. The clock source status bits
are not affected. This approach is a quick method to
switch from a given Run mode to its corresponding Idle
mode.
If the WDT is selected, the LF-INTOSC source will
continue to operate. If the SOSC oscillator is enabled,
it will also continue to run.
Since the CPU is not executing instructions, the only
exits from any of the Idle modes are by interrupt, WDT
time-out or a Reset. When a wake event occurs, CPU
execution is delayed by an interval of TCSD
(Parameter 38, Table 31-13) while it becomes ready to
execute code. When the CPU begins executing code,
it resumes with the same clock source for the current
Idle mode. For example, when waking from RC_IDLE
mode, the internal oscillator block will clock the CPU
and peripherals (in other words, RC_RUN mode). The
IDLEN and SCS bits are not affected by the wake-up.
While in any Idle mode or Sleep mode, a WDT time-
out will result in a WDT wake-up to the Run mode
currently specified by the SCS<1:0> bits.
FIGURE 4-5:
TRANSITION TIMING FOR ENTRY TO SLEEP MODE
FIGURE 4-6:
TRANSITION TIMING FOR WAKE FROM SLEEP (HSPLL)
Q4
Q3
Q2
OSC1
Peripheral
Sleep
Program
Q1
Counter
Clock
CPU
Clock
PC + 2
PC
Q3 Q4 Q1 Q2
OSC1
Peripheral
Program
PC
PLL Clock
Q3 Q4
Output
CPU Clock
Q1
Q2 Q3 Q4 Q1 Q2
Clock
Counter
PC + 6
PC + 4
Q1 Q2 Q3 Q4
Wake Event
Note 1:
TOST = 1024 TOSC; TPLL = 2 ms (approx). These intervals are not shown to scale.
TOST(1)
TPLL(1)
OSTS bit Set
PC + 2
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