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SDA 6000
PRELIMINARY DATA SHEET
Version 2.1
Interrupt and Trap Functions
5 - 12
Micronas
PSW
Reset Value: 0000
H
CPU Priority ILVL
defines the current level for the operation of the CPU. This bit field
reflects the priority level of the routine that is currently being executed. Upon entry into
an interrupt service routine, this bit field is updated with the priority level of the request
that is being serviced. The PSW is saved on the system stack before. The CPU level
determines the minimum interrupt priority level that will be serviced. Any request on the
same or lower level will not be acknowledged.
The current CPU priority level may be adjusted via software, to control which interrupt
request sources will be acknowledged.
PEC transfers do not really interrupt the CPU, but rather “steal” a single cycle, so PEC
services do not influence the ILVL field in the PSW.
Hardware traps switch the CPU level to maximum priority (i.e. 15) so no interrupt or PEC
requests will be acknowledged while an exception trap service routine is being executed.
Note: The TRAP instruction does not change the CPU level, so software invoked trap
service routines may be interrupted by higher requests.
Interrupt Enable bit IEN
globally enables or disables PEC operations and the
acceptance of interrupts by the CPU. When IEN is cleared, no new interrupt requests are
Bit
Function
N, C, V, Z, E,
MULIP,
USR0
CPU status flags
(Described in
Chapter 4.6
)
Define the current status of the CPU (ALU, multiplication unit).
HLDEN
HOLD Enable
(Enables External Bus Arbitration)
0:
Bus arbitration disabled, P6.7 ... P6.5 may be used for general
purpose IO
1:
Bus arbitration enabled, P6.7 ... P6.5 serve as BREQ, HLDA,
HOLD, resp.
ILVL
CPU Priority Level
Defines the current priority level for the CPU
F
H
: Highest
priority
level
0
H
: Lowest
priority
level
IEN
Interrupt Enable Control Bit
(globally enables/disables interrupt
requests)
‘0’:
Interrupt requests are disabled
‘1’:
Interrupt requests are enabled
HLD
EN
-
MUL
IP
USR0
N
Z
C
V
E
5
4
3
2
1
0
11
10
9
8
7
6
15
14
13
12
rw
rw
rw
rw
-
rw
rw
rw
-
rw
-
rw
IEN
-
-
ILVL
rw
Содержание SDA 6000
Страница 3: ...Contents Overview...
Страница 21: ...Pin Description...
Страница 22: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Pin Descriptions 2 3 Micronas 2 Pin Descriptions...
Страница 29: ...Architectural Overview...
Страница 33: ...C16X Microcontroller...
Страница 34: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 C16X Microcontroller 4 3 Micronas 4 C16X Microcontroller...
Страница 88: ...Interrupt and Trap Function...
Страница 122: ...System Control Configuration...
Страница 159: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 System Control Configuration 6 40 Micronas...
Страница 160: ...Peripherals...
Страница 282: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Peripherals 7 124 Micronas...
Страница 283: ...Clock System...
Страница 284: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Clock System 8 3 Micronas 8 Clock System...
Страница 288: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Clock System 8 8 Micronas...
Страница 289: ...Sync System...
Страница 290: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Sync System 9 3 Micronas 9 Sync System...
Страница 301: ...Display Generator...
Страница 302: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Display Generator 10 3 Micronas 10 Display Generator...
Страница 348: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Display Generator 10 50 Micronas...
Страница 349: ...D A Converter...
Страница 352: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 D A Converter 11 6 Micronas...
Страница 353: ...Slicer and Acquisition...
Страница 354: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Slicer and Acquisition 12 3 Micronas 12 Slicer and Acquisition...
Страница 381: ...Register Overview...
Страница 398: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Register Overview 13 20 Micronas...
Страница 399: ...Elelctrical Characteristics...
Страница 400: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Electrical Characteristics 14 3 Micronas 14 Electrical Characteristics...
Страница 411: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Electrical Characteristics 14 14 Micronas...