參數(shù)資料
型號： MC16V1CPU20B1
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 16-BIT, MROM, 20.97 MHz, MICROCONTROLLER, PQFP100
封裝： TQFP-100
文件頁數(shù)： 58/128頁
文件大?。?/td> 571K
代理商： MC16V1CPU20B1
MC68HC16V1
MOTOROLA
MC68HC16V1TS/D
35
When the real-time clock downcounter (RTDC) reaches zero, the RZ flag in the SYPCR is set to one.
An interrupt is generated if the TIEN bit is set and if TIQL[2:0] is non-zero. RTDC then loads the current
RTP value and begins counting again. When RESET is asserted, RTDC is not affected.
3.4.7 Real-Time Clock and Software Watchdog in Chained Mode
The real-time clock and the software watchdog can be chained together to form a 32-bit downcounter.
At this time, SWDC acts as the most significant word (MSW) and RTDC acts as the least significant
word (LSW). Upon reaching zero, the least significant word, rather than reloading the period register,
counts the SWDC down by one as it rolls over to $FFFF, and then continues counting.
One 32-bit or two 16-bit values can be written to the SWP and RTP registers to trigger the downcounter
chain.
NOTE
The downcounter chain does not begin counting until the lower byte of RTP is writ-
ten.
The counter can be read at any time. Anything other than 32-bit reads, however, may not be accurate.
The concatenated SWP/RTP count value is determined by the following equation:
1. Refer to Table 17 for chained timer time-out period information.
2. These frequency categories are frequencies which are output from the clock select mux to the prescaler. The
prescaler frequency is defined as fpre = fsys/2 if PCLK = 0 or fpre = fref/2 if PCLK = 1. Refer to Figure 9.
Table 16 Real-Time Period Ranges (Timers Not Chained)1
RTC[2:0] Clock
Control Settings
Clock
Source
Time-Out Ranges for Typical Values of fref and fsys
2
32.768 kHz
4.194 MHz
16.777 MHz
20.972 MHz
000
fsys/2
61.0
s to
4.0 s
477 ns to
31.3 ms
119 ns to
7.81 ms
95.4 ns to
6.25 ms
001
fref/2
61.0
s to
4.0 s
477 ns to
31.3 ms
119 ns to
7.81 ms
95.4 ns to
6.25 ms
010
fpre/1024
62.5 ms to
68.3 mins
488
s to
32 s
122
s to
8 s
97.7
s to
6.4 s
011
fpre/256
15.6 ms to
17.1 mins
122
s to
8 s
30.5
s to
2 s
24.4
s to
1.6 s
100
fpre/64
3.91 ms to
4.27 mins
30.5
s to
2 s
7.63
s to
500 ms
6.10
s to
400 ms
101
fpre/16
977
s to
64.0 s
7.63
s to
500 ms
1.91
s to
125 ms
1.53
s to
100 ms
1
0
Real-Time Clock Off
—
1
Real-Time Clock Off
—
RTDC — Real-Time Clock Downcounter
$YFFA5E
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
POWER-ON RESET ONLY:
0
Concatenated SWP/RTP Count Value
Desired Period of Chained Timer
RTC Clock Source
×
=
相關(guān)PDF資料
PDF描述
MC2670L DOT MAT LCD DRVR AND DSPL CTLR, CDIP28
MC2670P DOT MAT LCD DRVR AND DSPL CTLR, PDIP28
MC2671AS 1 CHANNEL(S), SERIAL COMM CONTROLLER, CDIP40
MC2671AL 1 CHANNEL(S), SERIAL COMM CONTROLLER, CDIP40
MC2675B5S SPECIALTY MICROPROCESSOR CIRCUIT, CDIP40
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC16XSD200FK 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Dual 16 mOhm High Side Switch
MC16Z1CFC25B1 制造商:Rochester Electronics LLC 功能描述:- Bulk
MC16Z1CPV20B1 制造商:Rochester Electronics LLC 功能描述:16 BIT MCU, 1K RAM - Bulk
MC16Z3BCAG16 功能描述:16位微控制器 - MCU 16BIT MCU 4KRAM 8KROM RoHS:否 制造商:Texas Instruments 核心:RISC 處理器系列:MSP430FR572x 數(shù)據(jù)總線寬度:16 bit 最大時鐘頻率:24 MHz 程序存儲器大小:8 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:VQFN-40 安裝風(fēng)格:SMD/SMT
MC-17 功能描述:TERM BARRIER 17CIRC DUAL ROW RoHS:是 類別:連接器，互連式 >> 接線座 - 隔板塊 系列:M 標(biāo)準(zhǔn)包裝:10 系列:Beau™ 38780 端接塊類型:阻隔塊 電路數(shù):15 導(dǎo)線入口數(shù)目:30 間距:0.438"（11.12mm） 行數(shù):2 電流:15A 電壓:300V 線規(guī):14-22 AWG 頂部端子:螺釘 底部端子:焊片 阻擋層類型:雙壁（雙） 特點:法蘭 顏色:黑 包裝:散裝 安裝類型:通孔 工作溫度:- 材料 - 絕緣體:聚對苯二甲酸丁二酯（PBT），玻璃纖維增強型 材料可燃性額定值:UL94 V-0 其它名稱:038780-111538780-1115387801115
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*