ST7LITEU09 STMicroelectronics, ST7LITEU09 Datasheet - Page 59

• Manufacturer Part Number: ST7LITEU09
• Description: ST7ULTRALITE - 8-BIT MCU WITH 2K SINGLE VOLTAGE FLASH MEMORY, ADC, TIMERS
• Manufacturer: STMicroelectronics

Specifications of ST7LITEU09

• 2k Bytes Single Voltage Flash Program Memory With Read-out Protection, In-circuit And In-application Programming (icp And Iap). 10k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55°C
• 128 Bytes Data Eeprom. 300k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55°C
• Clock Sources: internal trimmable 8MHz RC oscillator, internal low power, low frequency RC oscillator or external clock
• Five Power Saving Modes: Halt, Auto Wake Up from Halt, Active-Halt, Wait and Slow
• One 8-bit Lite Timer (lt) With Prescaler Including: watchdog, 1 realtime base and 1 input capture

ST7LITEU05 ST7LITEU09
Note:
Bit 2 = AWUF Auto Wake Up flag
Bit 1 = AWUM Auto Wake Up Measurement bit
Bit 0 = AWUEN Auto Wake Up From Halt Enabled bit
Whatever the clock source, this bit should be set to enable the AWUFH mode once the
HALT instruction has been executed.
AWUFH prescaler register (AWUPR)
Reset value: 1111 1111 (FFh)
Bits 7:0= AWUPR[7:0] Auto wakeup prescaler
Table 17.
In AWU mode, the time during which the MCU stays in Halt mode, t
equation below. See also
AWUPR7
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
This bit enables the AWU RC oscillator and connects 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 compensate this dispersion by providing the right value in the
AWUPRE register.
0: Measurement disabled
1: Measurement enabled
This bit enables the Auto Wake Up From Halt feature: once Halt mode is entered, the
AWUFH wakes up the microcontroller after a time delay dependent on the AWU
prescaler value. It is set and cleared by software.
0: AWUFH (Auto Wake Up From Halt) mode disabled
1: AWUFH (Auto Wake Up From Halt) mode enabled
These 8 bits define the AWUPR Dividing factor (see
7
AWUPR[7:0
Configuring the dividing factor
AWUPR6
FEh
FFh
00h
01h
...
]
AWUPR5
Figure 30 on page
AWUPR4
Read/Write
57.
AWUPR3
Dividing factor
Forbidden
Table
AWUPR2
254
255
...
1
17).
AWU
Power saving modes
AWUPR1
, is given by the
AWUPR0
0
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