ST52T440F3M6 STMicroelectronics, ST52T440F3M6 Datasheet - Page 41

• Manufacturer Part Number: ST52T440F3M6
• Description: MCU 8-Bit ST52 CISC 8KB EPROM 5V 20-Pin SO
• Manufacturer: STMicroelectronics

Specifications of ST52T440F3M6

• Package: 20SO
• Family Name: ST52
• Maximum Speed: 20 MHz
• Ram Size: 256 Byte
• Program Memory Size: 8 KB
• Operating Supply Voltage: 5 V
• Data Bus Width: 8 Bit
• Program Memory Type: EPROM
• Number Of Programmable I/os: 13
• On-chip Adc: 6-chx12-bit
• Operating Temperature: -40 to 85 °C
• Number Of Timers: 1

gram, the flags are restored and the program con-
tinues from the instruction immediately following
the interrupted instruction.
4.6 Interrupts and Low power mode
All interrupts allow the processor to leave WAIT
mode. Only an External Interrupt request allows
the processor to leave HALT mode: if the interrupt
is masked, the related interrupt routine is not ser-
viced and the program continues from the first
instruction after the HALT instruction.
4.7 Interrupt RESET
When an interrupt request is sent but the interrupt
is masked, it isn’t serviced and remains pending,
so that when the interrupt is enabled it is serviced
immediately. In order to avoid this from happen-
ing, the pending interrupt request can be reset
with the instruction RINT
interrupt j -th where j identify the peripherals as
described in the following table (see Table 4.4).
The assembler instruction:
RINT 2
Resets the TRIAC/PWM_F interrupt.
Figure 4.6 Example of a sequence of Interrupt Requests
PRIORITY
LEVEL
0
1
2
3
4
5
6
MAIN PROGRAM
j, which resets the
INT2
INT2
INT0
INT0
INT4
INT2
INT1
WARNING: If an interrupt is reset, with the RINT
instruction within its own interrupt routine, the
priority level of the interrupt becomes the lowest
and the routine can be immediately interrupted by
a lower priority interrupt request.
Table 4.4 RINT Instruction Code
(*) Not Used in ST52x400 devices
INT1
Analog Comparator (*)
Peripheral Name
External Interrupt
INT_TRIAC/R
INT_TRIAC/P
PWM/TIMER
INT2
INT3
TRIAC/F
INT3
ST52T400/T440/E440/T441
INT4
MAIN PROGRAM
Value
0
1
2
3
4
5
41/94