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參數資料
型號: MC68CK338
廠商: Motorola, Inc.
元件分類: 32位微控制器
英文描述: Highly Integrated, Low-Power, 32-Bit Microcontroller
中文描述: 高度集成,低功耗,32位微控制器
文件頁數: 38/133頁
文件大小: 798K
代理商: MC68CK338
MOTOROLA
38
MC68CK338
MC68CK338TS/D
This field only affects the response of chip-selects and does not affect interrupt recognition by the CPU.
Any level means that chip-select is asserted regardless of the level of the interrupt acknowledge cycle.
AVEC — Autovector Enable
0 = External interrupt vector enabled
1 = Autovector enabled
This field selects one of two methods of acquiring an interrupt vector number during an external interrupt
acknowledge cycle.
If the chip-select is configured to trigger on an interrupt acknowledge cycle (SPACE[1:0] = %00) and
the AVEC field is set to one, the chip-select circuit generates an internal AVEC signal in response to an
external interrupt cycle, and the SIML supplies an automatic vector number. Otherwise, the vector num-
ber must be supplied by the requesting device. An internal autovector is generated only in response to
interrupt requests from the SIML IRQ pins. Interrupt requests from other IMB modules are ignored.
The AVEC bit must not be used in synchronous mode, as autovector response timing can vary because
of ECLK synchronization.
3.6.5 Port C Data Register
Bit values in port C determine the state of chip-select pins used for discrete output. When a pin is as-
signed as a discrete output, the value in this register appears at the output. This is a read/write register.
Bit 7 is not used. Writing to this bit has no effect, and it always returns zero when read.
3.7 General-Purpose Input/Output
SIML pins can be configured as two general-purpose I/O ports, E and F. The following paragraphs de-
scribe registers that control the ports.
Table 28 Interrupt Priority Level Field Encoding
IPL[2:0]
000
001
010
011
100
101
110
111
Interrupt Priority Level
Any Level
1
2
3
4
5
6
7
PORTC —
Port C Data Register
$YFFA41
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
NOT USED
0
PC6
PC5
PC4
PC3
PC2
PC1
PC0
RESET:
0
1
1
1
1
1
1
1
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相關代理商/技術參數
參數描述
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MC68CM16Z1CPV16 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:M68HC16Z Series
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