參數(shù)資料
型號: XE8801AMI000WP
廠商: Semtech
文件頁數(shù): 73/135頁
文件大?。?/td> 0K
描述: SENSING MACHINE WITH 16 + 10 BIT
標(biāo)準(zhǔn)包裝: 558
系列: XE880x
應(yīng)用: 感測機(jī)
核心處理器: Coolrisc816?
程序存儲器類型: 閃存(22 kB)
控制器系列: XE8000
RAM 容量: 512 x 8
接口: UART,USRT
輸入/輸出數(shù): 24
電源電壓: 2.4 V ~ 5.5 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 模具
包裝: 托盤
配用: XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
其它名稱: Q2722595
Semtech 2005
www.semtech.com
7-2
XE8801A – SX8801R
7.1
Features
3 available clock sources (RC oscillator, quartz oscillator and external clock).
2 divider chains: high-prescaler (8 bits) and low-prescaler (15 bits).
CPU clock disabling in halt mode.
7.2
Overview
The XE8801AM – SX8801R chips can work on different clock sources (RC oscillator, quartz oscillator and external
clock). The clock generator block is in charge of distributing the necessary clock frequencies to the circuit.
Figure 7-1 represents the functionality of the clock block.
The internal RC oscillator drives the high prescaler. This prescaler generates frequency divisions down to 1/256 of
its input frequency. A 32 kHz clock is generated by enabling the quartz oscillator (if present in the product) or by
selecting the appropriate tap on the high prescaler. The low prescaler generates clock signals from 32 kHz down to
1Hz. The clock source for the CPU can be selected from the RC oscillator, the external clock or the 32 kHz clock.
7.3
Register map
pos.
RegSysClock
rw
Reset
function
7
CpuSel
rw
0 resetsleep
Select speed for cpuck, 0=RC, 1=xtal or
external clock
6
Extclk
r
0 resetcold
External clock detected, 1=available
5
EnExtClock
rw
0 resetcold
Enable for external clock, 1=enabled
4
BiasRc
rw
1 resetcold
Enable Rcbias (reduces start-up time of RC).
3
ColdXtal
r
1 resetsleep
Xtal in start phase
2
ColdRC
r
1 resetsleep
RC in start phase
1
EnableXtal
rw
0 resetsleep
Enable Xtal oscillator, 0=disabled, 1=enabled
0
EnableRc
rw
1 resetsleep
Enable RC oscillator, 0=disabled, 1=enabled
Table 7-1: RegSysClock register
pos.
RegSysMisc
rw
Reset
Function
7-4
--
r
0000
Unused
3
RCOnPA0
rw
0 resetsleep
Start RC on PA[0], 0=disabled, 1=enabled
2
DebFast
rw
0 resetsleep
Debouncer clock speed, 0=256Hz, 1=8kHz
1
OutputCkXtal
rw
0 resetsleep
Output Xtal Clock on PB[3], 0=disabled,
1=enabled if EnXtal=1 else PB[3]=0
0
OutputCpuCk
rw
0 resetsleep
Output CPU clock on PB[2], 0=disabled,
1=enabled
Table 7-2: RegSysMisc register
pos.
RegSysPre0
rw
reset
Function
7-1
--
r
0000000
Unused
0
ResPre
w1
r0
0
Write 1 to reset low prescaler, but always
reads 0
Table 7-3: RegSysPre0 register
Not
Recommended
for
New
Designs
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