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參數(shù)資料
| 型號(hào)： | DTMFDECODER-RD |
| 廠商： | Silicon Laboratories Inc |
| 文件頁(yè)數(shù)： | 162/178頁(yè) |
| 文件大小： | 0K |
| 描述： | KIT REF DESIGN DTMF DECODER |
| 應(yīng)用說(shuō)明： | DTMF Decoder Ref Design AppNote |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 電信，DTMF 解碼器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | C8051F300 |
| 主要屬性： | 8kHz 采樣速率模數(shù)轉(zhuǎn)換器 |
| 次要屬性： | 16 個(gè) Goertzel 濾波器 |
| 已供物品： | 板，軟件 |
| 產(chǎn)品目錄頁(yè)面： | 627 (CN2011-ZH PDF) |
| 相關(guān)產(chǎn)品： | 336-1535-5-ND - IC 8051 MCU 8K FLASH 14-SOIC C8051F300-GMR-ND - IC 8051 MCU 8K FLASH 11QFN 336-1245-ND - IC 8051 MCU 8K FLASH 11QFN |
| 其它名稱： | 336-1283 |
C8051F300/1/2/3/4/5
84
Rev. 2.9
9.1.
Power-On Reset
During powerup, the device is held in a reset state and the RST pin is driven low until VDD settles above
VRST. An additional delay occurs before the device is released from reset; the delay decreases as the VDD
ramp time increases (VDD ramp time is defined as how fast VDD ramps from 0 V to VRST). For valid ramp
times (less than 1 ms), the power-on reset delay (TPORDelay) is typically less than 0.3 ms.
Note: The maximum VDD ramp time is 1 ms; slower ramp times may cause the device to be
released from reset before VDD reaches the VRST level.
On exit from a power-on reset, the PORSF flag (RSTSRC.1) is set by hardware to logic 1. When PORSF is
set, all of the other reset flags in the RSTSRC Register are indeterminate (PORSF is cleared by all other
resets). Since all resets cause program execution to begin at the same location (0x0000) software can
read the PORSF flag to determine if a powerup was the cause of reset. The content of internal data mem-
ory should be assumed to be undefined after a power-on reset. The VDD monitor is disabled following a
power-on reset.
Power-On
Reset
VDD
Monitor
Reset
/RST
t
volt
s
1.0
2.0
Logic HIGH
Logic LOW
T
PORDelay
V
D
2.70
2.55
V
RST
VDD
Figure 9.2. Power-On and VDD Monitor Reset Timing
9.2.
Power-Fail Reset/VDD Monitor
When a power-down transition or power irregularity causes VDD to drop below VRST, the power supply
monitor will drive the RST pin low and hold the CIP-51 in a reset state (see Figure 9.2). When VDD returns
to a level above VRST, the CIP-51 will be released from the reset state. Note that even though internal data
memory contents are not altered by the power-fail reset, it is impossible to determine if VDD dropped below
the level required for data retention. If the PORSF flag reads ‘1’, the data may no longer be valid. The VDD
monitor is disabled after power-on resets; however its defined state (enabled/disabled) is not altered by
any other reset source. For example, if the VDD monitor is enabled and a software reset is performed, the
VDD monitor will still be enabled after the reset. The VDD monitor is enabled by writing a ‘1’ to the PORSF
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