ST52T430K3M6 STMicroelectronics, ST52T430K3M6 Datasheet - Page 28

• Manufacturer Part Number: ST52T430K3M6
• Manufacturer: STMicroelectronics

Specifications of ST52T430K3M6

• Cpu Family: ST52
• Device Core Size: 8b
• Frequency (max): 20MHz
• Interface Type: SCI/UART
• Program Memory Type: EPROM
• Program Memory Size: 8KB
• Total Internal Ram Size: 256Byte
• # I/os (max): 23
• Number Of Timers - General Purpose: 3
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5/5.8V
• Operating Supply Voltage (min): 2.7/3V
• On-chip Adc: 8-chx8-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 34
• Package Type: SSO
• Lead Free Status / Rohs Status: Not Compliant

ST52T430/E430
Figure 4.6 Example of a sequence of Interrupt requests
Note: The Interrupt priority must be fixed at the
beginning of the main program, because at the
RESET
REG_CONF18=’00000000’, that could generate
erroneous operations.
During program execution the interrupt priority can
only be modified, at main program level, with the
following procedure:
STEP 1:
Mask the interrupts by means of a UDGI (or MDGI)
instruction
STEP 2:
Change the REG_CONF 17 and REG_CONF18
values to modify the interrupt priority
STEP 3:
Reset all the pending interrupt instructions by
means of RINT instructions.
STEP 4:
Unmask the interrupts by means of a UEGI (or
MEGI) instruction
When a source provides an Interrupt request and
the request processing is also enabled, the CU
changes the normal sequential flow of a program
by transferring program control to a selected
service routine.
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PRIORITY
LEVEL
0
1
2
3
4
5
6
REG_CONF17=’00000000’
MAIN PROGRAM
INT2
INT2
INT0
INT0
INT4
&
INT2
INT1
When an interrupt occurs the CU executes a JUMP
instruction to the address loaded in the related
location of the Interrupt Vector.
When the execution returns to the original program
it immediately begins following the instruction that
was interrupted.
Table 4.4 RINT Instruction code
INT1
Peripheral Name
INT2
External Interrupt
INT3
PWM/TIMER 0
PWM/TIMER 1
PWM/TIMER 2
A/D Converter
INT3
SCI
INT4
MAIN PROGRAM
Value
0
1
2
3
4
5