参数资料
型号: ST7PL38F2MC/XXXE
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO20
封装: 0.300 INCH, ROHS COMPLIANT, PLASTIC, SOP-20
文件页数: 109/168页
文件大小: 2955K
代理商: ST7PL38F2MC/XXXE
Obsolete
Product(s)
- Obsolete
Product(s)
ST7L34, ST7L35, ST7L38, ST7L39
45/168
POWER SAVING MODES (cont’d)
9.6.0.1 Register Description
AWUFH CONTROL/STATUS REGISTER
(AWUCSR)
Read/Write
Reset Value: 0000 0000 (00h)
Bits 7:3 = Reserved
Bit 1 = 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 2 = AWUM Auto Wake Up Measurement
This bit enables the AWU RC oscillator and con-
nects its output to the input capture of the 12-bit
autoreload timer. This allows the timer to be used
to measure the AWU RC oscillator dispersion and
then compensate this dispersion by providing the
right value in the AWUPR 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
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 29 on page 43) 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 8. AWU Register Map and Reset Values
70
0000
0
AWUF AWUM AWUEN
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
765
4321
0
0049h
AWUPR
Reset Value
AWUPR7
1
AWUPR6
1
AWUPR5
1
AWUPR4
1
AWUPR3
1
AWUPR2
1
AWUPR1
1
AWUPR0
1
004Ah
AWUCSR
Reset Value
0
AWUF
AWUM
AWUEN
1
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