ST7FOXK1 STMicroelectronics, ST7FOXK1 Datasheet - Page 51

• 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
7
7.1
7.2
Note:
Interrupts
Introduction
The ST7 enhanced interrupt management provides the following features:
This interrupt management is based on:
This enhanced interrupt controller guarantees full upward compatibility with the standard
(not nested) ST7 interrupt controller.
Masking and processing flow
The interrupt masking is managed by the I1 and I0 bits of the CC register and the ISPRx
registers which give the interrupt software priority level of each interrupt vector (see
Table
When an interrupt request has to be serviced:
The interrupt service routine should end with the IRET instruction which causes the
contents of the saved registers to be recovered from the stack.
As a consequence of the IRET instruction, the I1 and I0 bits will be restored from the stack
and the program in the previous level will resume.
Hardware interrupts
Software interrupt (TRAP)
Nested or concurrent interrupt management with flexible interrupt priority and level
management:
–
–
–
Bit 5 and bit 3 of the CPU CC register (I1:0),
Interrupt software priority registers (ISPRx),
Fixed interrupt vector addresses located at the high addresses of the memory mapping
(FFE0h to FFFFh) sorted by hardware priority order.
Normal processing is suspended at the end of the current instruction execution.
The PC, X, A and CC registers are saved onto the stack.
I1 and I0 bits of CC register are set according to the corresponding values in the ISPRx
registers of the serviced interrupt vector.
The PC is then loaded with the interrupt vector of the interrupt to service and the first
instruction of the interrupt service routine is fetched (refer to interrupt mapping table for
vector addresses).
13). The processing flow is shown in
Up to 4 software programmable nesting levels
13 interrupt vectors fixed by hardware
2 non maskable events: RESET, TRAP
Figure
18.
Interrupts
51/226