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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： | 41/133頁 |
| 文件大小： | 798K |
| 代理商： | MC68CK338 |
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MC68CK338
MC68CK338TS/D
MOTOROLA
41
Data bus pin 9 controls the state of this register following reset. If DATA9 is set to one during reset, the
register is set to $FF, which defines all port F pins as interrupt request inputs. If DATA9 is cleared to
zero during reset, this register is set to $00, defining all port F pins as I/O pins.
3.8 Resets
Reset procedures handle system initialization and recovery from catastrophic failure. The MCU per-
forms resets with a combination of hardware and software. The SIML determines whether a reset is val-
id, asserts control signals, performs basic system configuration based on hardware mode-select inputs,
then passes control to the CPU.
Reset occurs when an active low logic level on the RESET pin is clocked into the SIML. Resets are gat-
ed by the CLKOUT signal. Asynchronous resets are assumed to be catastrophic. An asynchronous re-
set can occur on any clock edge. Synchronous resets are timed to occur at the end of bus cycles. If
there is no clock when RESET is asserted, reset does not occur until the clock starts. Resets are
clocked in order to allow completion of write cycles in progress at the time RESET is asserted.
Reset is the highest-priority CPU32L exception. Any processing in progress is aborted by the reset ex-
ception, and cannot be restarted. Only essential tasks are performed during reset exception processing.
Other initialization tasks must be accomplished by the exception handler routine.
3.8.1 SIML Reset Mode Selection
The logic states of certain data bus pins during reset determine SIML operating configuration. In addi-
tion, the state of the MODCLK pin determines system clock source and the state of the BKPT pin de-
termines what happens during subsequent breakpoint assertions.
Table 31
is a summary of reset mode
selection options.
Table 30 Port F Pin Assignments
PFPAR Field
PFPA7
PFPA6
PFPA5
PFPA4
PFPA3
PFPA2
PFPA1
PFPA0
Port F Signal
PF7
PF6
PF5
PF4
PF3
PF2
PF1
PF0
Alternate Signal
IRQ7
IRQ6
IRQ5
IRQ4
IRQ3
IRQ2
IRQ1
MODCLK
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相關代理商/技術參數 |
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