EZ80F91MCU ZILOG [Zilog, Inc.], EZ80F91MCU Datasheet - Page 85

• Manufacturer Part Number: EZ80F91MCU
• Description: eZ80Acclaim-TM Flash Microcontrollers
• Manufacturer: ZILOG [Zilog, Inc.]

PS019209-0504
Table 11. Interrupt Vector Sources by Priority (Continued)
The user’s program should store the interrupt service routine starting address in
the four-byte interrupt vector locations. As an example, in ADL mode, the three-
byte address for the SPI interrupt service routine is be stored at {I[15:1], 07Ch},
{I[15:1], 07Dh} and {I[15:1], 07Eh}. In Z80 mode, the two-byte address for the SPI
interrupt service routine is be stored at {MBASE[7:0], I[7:1], 07Ch} and {MBASE,
I[7:1], 07Dh}. The least-significant byte is stored at the lower address.
When any one or more of the interrupt requests (IRQs) become active, an inter-
rupt request is generated by the interrupt controller and sent to the CPU. The cor-
responding 9-bit interrupt vector for the highest-priority interrupt is placed on the
9-bit interrupt vector bus, IVECT[8:0]. The interrupt vector bus is internal to the
eZ80F91 device and is therefore not visible externally. The response time of the
CPU to an interrupt request is a function of the current instruction being executed
as well as the number of wait states being asserted. The interrupt vector, {I[15:1],
IVECT[8:0]}, is visible on the address bus, ADDR[23:0], when the interrupt service
routine begins. The response of the CPU to a vectored interrupt on the eZ80F91
Note: *The vector addresses 064h and 068h are left unused to avoid conflict with the nonmaskable
Priority
10
11
12
13
14
15
16
17
18
19
20
21
22
23
9
interrupt (NMI) address 066h. The NMI is prioritized higher than all maskable interrupts.
Vector
06Ch
07Ch
08Ch
09Ch
064h
068h
070h
074h
078h
080h
084h
088h
090h
094h
098h
P R E L I M I N A R Y
unused*
unused*
UART 0
UART 1
Port A 0
Port A 1
Port A 2
Port A 3
Port A 4
Port A 5
Port A 6
Port A 7
Source
RTC
SPI
I
2
C
Priority
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
Vector
0CCh
0DCh
0ECh
0C4h
0C8h
0D0h
0D4h
0D8h
0FCh
0E0h
0E4h
0E8h
0F0h
0F4h
0F8h
Product Specification
Interrupt Controller
eZ80F91 MCU
Port C 1
Port C 2
Port C 3
Port C 4
Port C 5
Port C 6
Port C 7
Port D 0
Port D 1
Port D 2
Port D 3
Port D 4
Port D 5
Port D 6
Port D 7
Source
66