ST92F120V1Q7 STMicroelectronics, ST92F120V1Q7 Datasheet - Page 99

• Manufacturer Part Number: ST92F120V1Q7
• Description: Microcontrollers (MCU) Flash 128K SPI/I2C
• Manufacturer: STMicroelectronics

Specifications of ST92F120V1Q7

• Data Bus Width: 8 bit, 16 bit
• Program Memory Type: Flash
• Program Memory Size: 128 KB
• Data Ram Size: 4 KB
• Interface Type: I2C, SPI
• Maximum Clock Frequency: 24 MHz
• Number Of Programmable I/os: 77
• Number Of Timers: 5
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• Package / Case: PQFP-100
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit, 16 Channel
• Lead Free Status / Rohs Status: No

Figure 46. Example of Low Power mode programming in WFI using CK_AF external clock
n
Interrupt
CKAF_SEL
CSU_CKSEL
Interrupt Routine
CSU_CKSEL
PROGRAM FLOW
WFI_CKSEL
User’s Program
User’s Program
WFI instruction
XTSTOP
XTSTOP
LPOWFI
MX(1:0)
DX2-0
WFI status
WAIT
WAIT
WAIT
Begin
000
1
0
00
0
1
1
1
1
CK_AF selected and Xtal stopped
ST92F120 - RESET AND CLOCK CONTROL UNIT (RCCU)
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
Preselect Xtal stopped
Wait for the PLL to lock
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
automatically
Reset State
set to 10
activated
to stabilise
** T
* T
PLK
STUP
= PLL lock-in time
= Quartz oscillator start-up time
F
T
T
Xtal
PLK
STUP
INTCLK FREQUENCY
= 4 MHz, V
*
**
20 MHz
2 MHz
20 MHz
2 MHz
F
DD
CK_AF
= 4.5 V min
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