XE8801AMI027LF Semtech, XE8801AMI027LF Datasheet - Page 42
XE8801AMI027LF
Manufacturer Part Number
XE8801AMI027LF
Description
IC DAS 16BIT FLASH 8K MTP 44LQFP
Manufacturer
Semtech
Datasheet
1.XE8801AMI027LF.pdf
(135 pages)
Specifications of XE8801AMI027LF
Applications
Sensing Machine
Core Processor
RISC
Program Memory Type
FLASH (22 kB)
Controller Series
XE8000
Ram Size
512 x 8
Interface
UART, USRT
Number Of I /o
24
Voltage - Supply
2.4 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
44-LQFP
For Use With
XE8000MP - PROG BOARD AND PROSTART2 CARD
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
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Manufacturer
Quantity
Price
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7.1 Features
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
© Semtech 2005
•
•
•
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
6
5
4
3
2
1
0
7-4
3
2
1
0
7-1
0
pos.
pos.
pos.
CpuSel
Extclk
EnExtClock
BiasRc
ColdXtal
ColdRC
EnableXtal
EnableRc
--
RCOnPA0
DebFast
OutputCkXtal
OutputCpuCk
--
ResPre
RegSysClock
RegSysMisc
RegSysPre0
rw
r
rw
rw
r
r
rw
rw
r
rw
rw
rw
rw
r
w1
r0
rw
rw
rw
Table 7-1: RegSysClock register
Table 7-2: RegSysMisc register
Table 7-3: RegSysPre0 register
0 resetsleep
0 resetcold
0 resetcold
1 resetcold
1 resetsleep
1 resetsleep
0 resetsleep
1 resetsleep
0000
0 resetsleep
0 resetsleep
0 resetsleep
0 resetsleep
0000000
0
Reset
Reset
reset
7-2
Select speed for cpuck, 0=RC, 1=xtal or
external clock
External clock detected, 1=available
Enable for external clock, 1=enabled
Enable Rcbias (reduces start-up time of RC).
Xtal in start phase
RC in start phase
Enable Xtal oscillator, 0=disabled, 1=enabled
Enable RC oscillator, 0=disabled, 1=enabled
Unused
Start RC on PA[0], 0=disabled, 1=enabled
Debouncer clock speed, 0=256Hz, 1=8kHz
Output Xtal Clock on PB[3], 0=disabled,
1=enabled if EnXtal=1 else PB[3]=0
Output CPU clock on PB[2], 0=disabled,
1=enabled
Unused
Write 1 to reset low prescaler, but always
reads 0
Function
Function
function
XE8801A – SX8801R
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