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参数资料
型号： ST7PLITEUS5U3TR
厂商： STMICROELECTRONICS
元件分类： 微控制器/微处理器
英文描述： 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, DSO8
封装： LEAD FREE, DFN-8
文件页数： 44/108页
文件大小： 1957K
代理商： ST7PLITEUS5U3TR
ST7LITEUSx
40/108
POWER SAVING MODES (Cont’d)
8.5.1 Register Description
AWUFH CONTROL/STATUS REGISTER
(AWUCSR)
Read/Write
Reset Value: 0000 0000 (00h)
Bits 7:3 = Reserved.
Bit 2= AWUF Auto Wake Up Flag
This bit is set by hardware when the AWU module
generates an interrupt and cleared by software on
reading AWUCSR. Writing to this bit does not
change its value.
0: No AWU interrupt occurred
1: AWU interrupt occurred
Bit 1= AWUM Auto Wake Up Measurement
This bit enables the AWU RC oscillator and con-
nects its output to the input capture of the 8-bit Lite
timer. This allows the timer to be used to measure
the AWU RC oscillator dispersion and then com-
pensate this dispersion by providing the right value
in the AWUPRE register.
0: Measurement disabled
1: Measurement enabled
Bit 0 = AWUEN Auto Wake Up From Halt Enabled
This bit enables the Auto Wake Up From Halt fea-
ture: once HALT mode is entered, the AWUFH
wakes up the microcontroller after a time delay de-
pendent on the AWU prescaler value. It is set and
cleared by software.
0: AWUFH (Auto Wake Up From Halt) mode disa-
bled
1: AWUFH (Auto Wake Up From Halt) mode ena-
bled
Note: whatever the clock source, this bit should be
set to enable the AWUFH mode once the HALT in-
struction has been executed.
AWUFH PRESCALER REGISTER (AWUPR)
Read/Write
Reset Value: 1111 1111 (FFh)
Bits 7:0= AWUPR[7:0] Auto Wake Up Prescaler
These 8 bits define the AWUPR Dividing factor (as
explained below:
In AWU mode, the period that the MCU stays in
Halt Mode (tAWU in Figure 26 on page 38) is de-
fined by
This prescaler register can be programmed to
modify the time that the MCU stays in Halt mode
before waking up automatically.
Note: If 00h is written to AWUPR, depending on
the product, an interrupt is generated immediately
after a HALT instruction, or the AWUPR remains
unchanged.
Table 11. AWU Register Map and Reset Values
70
00
000
AWU
F
AWU
M
AWU
EN
70
AWU
PR7
AWU
PR6
AWU
PR5
AWU
PR4
AWU
PR3
AWU
PR2
AWU
PR1
AWU
PR0
AWUPR[7:0
]
Dividing factor
00h
Forbidden
01h
1
...
FEh
254
FFh
255
t
AWU
64
AWUPR
×
1
f
AWURC
--------------------------t
RCSTRT
+
×
=
Address
(Hex.)
Register
Label
76543
210
0049h
AWUPR
Reset Value
AWUPR7
1
AWUPR6
1
AWUPR5
1
AWUPR4
1
AWUPR3
1
AWUPR2
1
AWUPR1
1
AWUPR0
1
004Ah
AWUCSR
Reset Value
00000
AWUF
AWUM
AWUEN
1
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