ST7LITEU09 STMicroelectronics, ST7LITEU09 Datasheet - Page 58

• 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

Power saving modes
9.5.1
58/139
Figure 31. AWUFH mode flowchart
1. WDGHALT is an option bit. See option byte section for more details.
2. Peripheral clocked with an external clock source can still be active.
3. Only an AWUFH interrupt and some specific interrupts can exit the MCU from Halt mode (such as external
4. Before servicing an interrupt, the CC register is pushed on the stack. The I[1:0] bits of the CC register are
Register description
AWUFH control/status register (AWUCSR)
Reset value: 0000 0000 (00h)
Bits 7:3 = Reserved
interrupt). Refer to Table 10, “Interrupt mapping,” on page 44 for more details.
set to the current software priority level of the interrupt routine and recovered when the CC register is
popped.
0
7
0
0
(AWUCSR.AWUEN=1)
HALT INSTRUCTION
N
(Active-Halt disabled)
WATCHDOG
WDGHALT
RESET
1
INTERRUPT
Y
1)
0
Read/Write
ENABLE
3)
256 OR 512 CPU CLOCK
OR SERVICE INTERRUPT
0
FETCH RESET VECTOR
AWU RC OSC
MAIN OSC
PERIPHERALS
CPU
AWU RC OSC
MAIN OSC
PERIPHERALS
CPU
MAIN OSC
PERIPHERALS
CPU
I[1:0] BITS
I[1:0] BITS
AWU RC OSC
I[1:0] BITS
N
CYCLE
0
RESET
WATCHDOG
Y
DELAY
DISABLE
2)
XX
XX
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
10
AWUF
4)
4)
ST7LITEU05 ST7LITEU09
AWUM
AWUEN
0