st52f513 STMicroelectronics, st52f513 Datasheet - Page 45

• Manufacturer Part Number: st52f513
• Description: 8-bit Microcontrollers
• Manufacturer: STMicroelectronics

High Priority Register (INT_PRL_H)
Configuration Register 4 (04h) Read/Write
Reset Value: 1000 1000 (088h)
These three register are used to configure the
priority level of each interrupt source. The 24 bits
of these registers (PRL23-PRL0) are divided into 8
groups of three bits: each group is associated with
a priority level (from level 1, the highest, to level 8,
the lowest: level 0 is fixed for the NMI that can be
interrupted only by the TRAP). The three bits of
each group are written with the code number
associated with the interrupt source (see
5.1).
Table 5.1 Interrupt source parameters
PRL7
A/D Converter
PWM/Timer 0
PWM/Timer 1
SCI
SPI
I
Port A
Port B
NMI
TRAP
2
7
C Interface
Interrupt Source
PRL6
PRL5
PRL4
Fixed to highest
PRL3
Programmable
Programmable
Programmable
Programmable
Programmable
Programmable
Programmable
Programmable
Priority type
Fixed
PRL2
PRL1
Table
PRL code
PRL0
0
000
001
010
100
101
011
110
111
-
-
PRL2-PRL0: Interrupt priority level 1 (highest)
PRL5-PRL3: Interrupt priority level 2
PRL8-PRL6: Interrupt priority level 3
PRL11-PRL9:Interrupt priority level 4
PRL14-PRL12: Interrupt priority level 5
PRL17-PRL15: Interrupt priority level 6
PRL20-PRL18: Interrupt priority level 7
PRL23-PRL21: Interrupt priority level 8 (lowest)
Example: writing the code 110 into PRL8-PRL6
bits the priority level 3 is assigned to the Port A
Interrupt.
Warning: the Priority Level configuration registers
must be always configured with consistent values.
RINT code
0
1
2
3
4
5
6
7
8
-
Maskable
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
ST52510xx ST52513xx
27-29 (01Bh-01Dh)
Vector Addresses
24-26 (018h-01Ah)
30-32 (01Eh-020h)
18-20 (012h-014h)
21-23 (015h-017h)
15-17 (0Fh-011h)
12-14 (0Ch-0Eh)
9-11 (09h-0Bh)
3-5 (03h-05h)
6-8 (06h-08h)
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