z8f1621 ZiLOG Semiconductor, z8f1621 Datasheet - Page 80
![no-image](/images/no-image-200.jpg)
z8f1621
Manufacturer Part Number
z8f1621
Description
High Performance 8-bit Microcontrollers
Manufacturer
ZiLOG Semiconductor
Datasheet
1.Z8F1621.pdf
(297 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
z8f1621AN020EG
Manufacturer:
Zilog
Quantity:
356
Company:
Part Number:
z8f1621AN020SG
Manufacturer:
Zilog
Quantity:
918
Company:
Part Number:
z8f1621PM020SG
Manufacturer:
Zilog
Quantity:
673
Company:
Part Number:
z8f1621VN020SG
Manufacturer:
Zilog
Quantity:
6
- Current page: 80 of 297
- Download datasheet (9Mb)
PS019921-0308
Interrupt Vectors and Priority
Interrupt Assertion
Caution:
Software Interrupt Assertion
Caution:
The interrupt controller supports three levels of interrupt priority. Level 3 is the highest
priority, Level 2 is the second highest priority, and Level 1 is the lowest priority. If all of
the interrupts were enabled with identical interrupt priority (all as Level 2 interrupts, for
example), then interrupt priority would be assigned from highest to lowest as specified in
Table 23
which, in turn, always have higher priority than Level 1 interrupts. Within each interrupt
priority level (Level 1, Level 2, or Level 3), priority is assigned as specified in
page 63. Reset, Watchdog Timer interrupt (if enabled), and Illegal Instruction Trap always
have highest priority.
Interrupt sources assert their interrupt requests for only a single system clock period
(single pulse). When the interrupt request is acknowledged by the eZ8 CPU, the
corresponding bit in the Interrupt Request register is cleared until the next interrupt
occurs. Writing a 0 to the corresponding bit in the Interrupt Request register likewise
clears the interrupt request.
Program code can generate interrupts directly. Writing a 1 to the desired bit in the Interrupt
Request register triggers an interrupt (assuming that interrupt is enabled). When the inter-
rupt request is acknowledged by the eZ8 CPU, the bit in the Interrupt Request register is
automatically cleared to 0.
The following style of coding to clear bits in the Interrupt Request registers is
NOT recommended. All incoming interrupts that are received between
execution of the first LDX command and the last LDX command are lost.
the Interrupt Request 0 register is recommended:
The following style of coding to generate software interrupts by setting bits in
the Interrupt Request registers is NOT recommended. All incoming interrupts
To avoid missing interrupts, the following style of coding to clear bits in
on page 63. Level 3 interrupts always have higher priority than Level 2 interrupts
Poor coding style that can result in lost interrupt requests:
Good coding style that avoids lost interrupt requests:
LDX r0, IRQ0
AND r0, MASK
LDX IRQ0, r0
ANDX IRQ0, MASK
Z8 Encore! XP
Product Specification
®
Interrupt Controller
F64XX Series
Table 23
on
66
Related parts for z8f1621
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![z8f1601](/images/no-image3.png)
Part Number:
Description:
Z8 Encore!? Microcontroller With Flash Memory And 10-bit A/d Converter
Manufacturer:
ZiLOG Semiconductor
Datasheet:
![z8f2421pm020e](/images/no-image3.png)
Part Number:
Description:
Z8 Encore! Xp F64xx Series
Manufacturer:
ZiLOG Semiconductor
Datasheet:
![z8fmc16100](/images/no-image3.png)
Part Number:
Description:
Z8 Encore Motor Control Flash Mcus
Manufacturer:
ZiLOG Semiconductor
Datasheet:
![Z8F082A28100KIT](/images/no-image3.png)
Part Number:
Description:
Z8 Encore XP-R F08xA Series with eXtended Peripherals
Manufacturer:
ZILOG [Zilog, Inc.]
Datasheet:
![Z8F1602](/images/no-image3.png)
Part Number:
Description:
Z8 Encore Microcontrollers with Flash Memory and 10-Bit A/D Converter
Manufacturer:
ZILOG [Zilog, Inc.]
Datasheet:
![Z8FMC04100](/images/no-image3.png)
Part Number:
Description:
Z8 Encore-R Motor Control Flash MCUs
Manufacturer:
ZILOG [Zilog, Inc.]
Datasheet:
![Z8FMC16MCU](/images/no-image3.png)
Part Number:
Description:
Z8 Encore-R Motor Control Series
Manufacturer:
ZILOG [Zilog, Inc.]
Datasheet:
![Z86C8316PEC](/images/no-image3.png)
Part Number:
Description:
Z8 MCU MICROCONTROLLERS
Manufacturer:
ZILOG [Zilog, Inc.]
Datasheet:
![Z8F160x](/images/manufacturer_photos/0/7/729/zilog_tmb.jpg)
Part Number:
Description:
Z8 Encore / Microcontrollers with Flash Memory and 10 Bit A/D Converter
Manufacturer:
Zilog
Datasheet:
![Z86C83](/images/no-image3.png)
Part Number:
Description:
Z8 MCU MICROCONTROLLERS
Manufacturer:
Zilog.
Datasheet:
![ez80f915005modg](/images/no-image3.png)
Part Number:
Description:
Ez80f91 Mini Enet Module
Manufacturer:
ZiLOG Semiconductor
Datasheet:
![z90231](/images/no-image3.png)
Part Number:
Description:
Z90233, Z90234, And Z90231 Ezvision 200 Television Controller
Manufacturer:
ZiLOG Semiconductor
Datasheet:
![z90212](/images/no-image3.png)
Part Number:
Description:
Digital Television Controllers
Manufacturer:
ZiLOG Semiconductor
Datasheet:
![z90209](/images/no-image3.png)
Part Number:
Description:
Television Controllers
Manufacturer:
ZiLOG Semiconductor
Datasheet:
![z90102](/images/no-image3.png)
Part Number:
Description:
40-pin Low-cost Digital Television Controller
Manufacturer:
ZiLOG Semiconductor
Datasheet: