參數(shù)資料
型號(hào): XE8807AMI026TLF
廠商: Semtech
文件頁數(shù): 80/143頁
文件大?。?/td> 0K
描述: IC MCU LOW PWR MTP FLASH 32-TQFP
標(biāo)準(zhǔn)包裝: 1
系列: XE880x
應(yīng)用: 感測(cè)機(jī)
核心處理器: Coolrisc816?
程序存儲(chǔ)器類型: 閃存(11 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: 32-TQFP
包裝: 標(biāo)準(zhǔn)包裝
供應(yīng)商設(shè)備封裝: 32-TQFP(7x7)
產(chǎn)品目錄頁面: 585 (CN2011-ZH PDF)
配用: XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
其它名稱: XE8807AMI026DKR
Semtech 2006
www.semtech.com
7-2
XE8806A/XE8807A
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 XE88LCxx 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 or an external clock source can be selected to drive the high prescaler. This prescaler
generates frequency divisions down to 1/256 of its input frequency. A 32kHz 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 32kHz down to 1Hz. The clock source for the CPU can be selected from
the RC oscillator, the external clock or the 32kHz clock.
7.3
Register map
pos.
RegSysClock
rw
reset
function
7
CpuSel
r/w
0 nresetsleep
Select speed for cpuck
6
-
r
0
Unused
5
EnExtClock
r/w
0 nresetcold
Enable for external clock
4
BiasRc
r/w
1 nresetcold
Enable Rcbias (reduces start-up time of RC).
3
ColdXtal
r
1 nresetsleep
Xtal in start phase
2
-
r
0
Unused
1
r/w
0 nresetsleep
Enable Xtal oscillator
0
EnableRc
r/w
1 nresetsleep
Enable RC oscillator
Table 7-1: RegSysClock register
pos.
RegSysMisc
rw
reset
function
7-2
--
r
000000
Unused
1
Output16k
r/w
0 nresetsleep
Output 16 kHz signal on PB[3]
0
OutputCpuCk
r/w
0 nresetsleep
Output CPU clock on PB[2]
Table 7-2: RegSysMisc register
pos.
RegSysPre0
rw
reset
function
7-1
--
r
0000000
Unused
0
ClearLowPrescal
w1
r0
0
Write 1 to reset low prescaler, but always
reads 0
Table 7-3: RegSysPre0 register
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