參數(shù)資料
型號: Z86108
廠商: ZiLOG, Inc.
英文描述: 8 Bit CMOS Low Cost MCU(8位CMOS低成本微控制器(帶2K ROM))
中文描述: 8位CMOS低成本微控制器(8位的CMOS低成本微控制器(帶2K光盤))
文件頁數(shù): 18/28頁
文件大?。?/td> 394K
代理商: Z86108
Z86108
CMOS 8-Bit Low-Cost 2K-ROM Microcontrollers
ZiLOG
18
P R E L I M I N A R Y
DS001800-Z8X0898
FUNCTIONAL DESCRIPTION
(Continued)
Interrupts.
The Z8 has six interrupts from six different
sources. These interrupts are maskable and prioritized (Fig-
ure 14). The six sources are divided as follows: the falling
edge of P31 (AN1), P32 (AN2), P33 (REF), the rising edge
of P32 (AN2), and the two counter/timers. The Interrupt
Mask Register globally or individually enables or disables
the six interrupt requests (Table 2).
When more than one interrupt is pending, priorities are re-
solved by a programmable priority encoder that is con-
trolled by the Interrupt Priority register. All Z8 interrupts
are vectored through locations in program memory. When
an Interrupt machine cycle is activated, an interrupt request
is granted. The interrupt request disables all subsequent in-
terrupts, saving the Program Counter and Status Flags. This
request, in turn, branches to the program memory vector lo-
cation reserved for that interrupt. The above-mentioned
memory location and the next byte contain the 16-bit start-
ing address of the interrupt service routine for that particular
interrupt request.
To accommodate polled interrupt systems, interrupt inputs
are masked and the interrupt request register is polled to de-
termine which of the interrupt requests needs service.
Note:
User must select any Z86C08 mode in ZiLOG’s C12
ICEBOX
ported on the Z86CCP00ZEM emulator, except through
a hardware/software workaround. See the Z86CCP Us-
er’s Manual for complete information on the emulator.
emulator. The rising edge interrupt is not sup-
Table 3. Interrupt Types, Sources, and Vectors
Name
IRQ0
IRQ1
IRQ2
IRQ3
IRQ4
IRQ5
Notes:
F = Falling edge triggered
R = Rising edge triggered
Source
AN2(P32)
REF(P33) 2,3
AN1(P31)
AN2(P32)
T0
T1
Vector
Location
0,1
Comments
External (F) Edge
External (F) Edge
External (F) Edge
External (R) Edge
Internal
Internal
4,5
6,7
8,9
10,11
Figure 14. Interrupt Block Diagram
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