ST7LITE49M STMicroelectronics, ST7LITE49M Datasheet - Page 59
ST7LITE49M
Manufacturer Part Number
ST7LITE49M
Description
8-bit MCU
Manufacturer
STMicroelectronics
Datasheet
1.ST7LITE49M.pdf
(187 pages)
Specifications of ST7LITE49M
4 Kbytes Single Voltage Extended Flash (xflash) Program Memory With Read-out Protection In-circuit Programming And In-application Programming (icp And Iap) Endurance
10k write/erase cycles guaranteed Data retention
128 Bytes Data Eeprom With Read-out Protection. 300k Write/erase Cycles Guaranteed, Data Retention
20 years at 55 °C.
Clock Sources
Internal trimmable 8 MHz RC oscillator, auto-wakeup internal low power - low frequency oscillator, crystal/ceramic resonator or external clock
Five Power Saving Modes
Halt, Active-halt, Auto-wakeup from Halt, Wait and Slow
A/d Converter
10 input channels
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ST7LITE49M
9.4
Figure 26. Wait mode flowchart
1. Before servicing an interrupt, the CC register is pushed on the stack. The I bit of the CC register is set
Active-halt and Halt modes
Active-halt and Halt modes are the two lowest power consumption modes of the MCU. They
are both entered by executing the ‘HALT’ instruction. The decision to enter either in Active-
halt or Halt mode is given by the LTCSR/ATCSR register status as shown in the following
table:
Table 20.
LTCSR TBIE
during the interrupt routine and cleared when the CC register is popped.
bit
0
0
0
1
x
Enabling/disabling Active-halt and Halt modes
ATCSR OVFIE
bit
0
1
1
x
x
WFI INSTRUCTION
N
Doc ID 13562 Rev 3
ATCSRCK1 bit ATCSRCK0 bit
INTERRUPT
Y
x
x
1
x
0
OR SERVICE INTERRUPT
FETCH RESET VECTOR
256 CPU CLOCK CYCLE
OSCILLATOR
PERIPHERALS
CPU
I BIT
OSCILLATOR
PERIPHERALS
CPU
I BIT
OSCILLATOR
PERIPHERALS
CPU
I BIT
N
DELAY
RESET
Y
0
1
1
x
x
OFF
OFF
X
ON
ON
ON
ON
ON
ON
ON
0
0
1)
Active-halt mode disabled
Active-halt mode enabled
Power saving modes
Meaning
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