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ST7DALI Datasheet(PDF) 45 Page - STMicroelectronics

Part No. ST7DALI
Description  8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, DATA EEPROM, ADC, TIMERS, SPI, DALI
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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ST7DALI
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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 1= AWUM Auto Wake Up Measurement
This bit enables the AWU RC oscillator and con-
nects its output to the inputcapture of the 12-bit
Auto-Reload timer. This allows the timer to be
used to measure the AWU RC oscillator disper-
sion and then compensate this dispersion by pro-
viding 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
AWUFH PRESCALER REGISTER (AWUPR)
Read/Write
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 28 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
inchanged.
Table 7. 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
Ă—
1
f
AWURC
--------------------------t
RCSTRT
+
Ă—
=
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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