ST7FOXK1 STMicroelectronics, ST7FOXK1 Datasheet - Page 63

• Manufacturer Part Number: ST7FOXK1
• Description: Low cost flash 8bit micro
• Manufacturer: STMicroelectronics

Specifications of ST7FOXK1

• 4 To 8 Kbytes Single Voltage Extended Flash (xflash) Program Memory With Read-out Protection In-circuit Programming And In-application Programming (icp And Iap) Endurance: 1K write/erase cycles guaranteed Data retention
• 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: up to 10 input channels

ST7FOXF1, ST7FOXK1, ST7FOXK2
8.4
Figure 24. 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
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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