ST92F150CV1 STMicroelectronics, ST92F150CV1 Datasheet - Page 132

• Manufacturer Part Number: ST92F150CV1
• Description: 8-bit MCU
• Manufacturer: STMicroelectronics

Specifications of ST92F150CV1

• Internal Memory: Single Voltage FLASH up to 256 Kbytes, RAM up to 8Kbytes, 1K byte E3 (Emulated EEPROM)
• Minimum Instruction Time: 83 ns (24 MHz int. clock)

ST92F124/F150/F250 - RESET AND CLOCK CONTROL UNIT (RCCU)
Figure 63. Example of Low Power mode programming in WFI using CK_AF external clock
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9
Interrupt
CKAF_SEL ← 0
CSU_CKSEL ← 1
Interrupt Routine
CSU_CKSEL ← 1
PROGRAM FLOW
WFI_CKSEL ← 1
User’s Program
User’s Program
WFI instruction
XTSTOP ← 0
XTSTOP ← 1
LPOWFI ← 1
MX[1:0] ← 00
DX[2:0] ← 000
WFI status
WAIT
Begin
WAIT
WAIT
CK_AF selected and Xtal stopped
Wait for the Xtal
PLL is System Clock source
PLL is system clock source
Low Power Mode enabled
No code is executed until
to 1, and PLL turned ON
an interrupt is requested
Wait for the PLL to lock
Preselect Xtal stopped
Wait for the PLL to lock
Execution of user program
when CK_AF selected
CK_AF clock selected
The System Clock
and the Xtal restarts
resumes at full speed
PLL multiply factor
Interrupt serviced
the System Clock
switches to Xtal
Wait For Interrupt
Divider factor set
while CK_AF is
in WFI state
in WFI state
Reset State
automatically
set to 10
activated
to stabilise
** T
* T
1
2
= Quartz oscillator start-up time
= PLL lock-in time
F
T
Xtal
INTCLK FREQUENCY
T
2
1
**
= 4 MHz
*
20 MHz
2 MHz
20 MHz
2 MHz
F
CK_AF