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| 型號(hào)： | MC68HC001EI8 |
| 廠商： | Freescale Semiconductor |
| 文件頁(yè)數(shù)： | 141/189頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC MPU 16BIT 8MHZ 68-PLCC |
| 標(biāo)準(zhǔn)包裝： | 18 |
| 系列： | M680x0 |
| 處理器類(lèi)型： | M680x0 32-位 |
| 速度： | 8MHz |
| 電壓： | 3.3V，5V |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 68-LCC（J 形引線） |
| 供應(yīng)商設(shè)備封裝： | 68-PLCC（25x25） |
| 包裝： | 管件 |
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MOTOROLA
M68000 8-/16-/32-BIT MICROPROCESSORS USER'S MANUAL
5- 9
STATE 12
The write portion of the cycle starts in S12. The valid function codes on
FC2–FC0, the address bus lines, AS, and R/W remain unaltered.
STATE 13
During S13, no bus signals are altered.
STATE 14
On the rising edge of S14, the processor drives R/W low.
STATE 15
During S15, the data bus is driven out of the high-impedance state as the
data to be written are placed on the bus.
STATE 16
At the rising edge of S16, the processor asserts UDS or LDS . The
processor waits for DTACK or BERR or VPA, an M6800 peripheral signal.
When VPA is asserted during S16, the cycle becomes a peripheral cycle
(refer to Appendix B M6800 Peripheral Interface). If neither termination
signal is asserted before the falling edge at the close of S16, the processor
inserts wait states (full clock cycles) until either DTACK or BERR is asserted.
STATE 17
During S17, no bus signals are altered.
STATE 18
During S18, no bus signals are altered.
STATE 19
On the falling edge of the clock entering S19, the processor negates AS,
UDS , and LDS . As the clock rises at the end of S19, the processor
places the address and data buses in the high-impedance state, and drives
R/W high. The device negates DTACK or BERR at this time.
5.1.4 CPU Space Cycle
A CPU space cycle, indicated when the function codes are all high, is a special processor
cycle. Bits A16–A19 of the address bus identify eight types of CPU space cycles. Only the
interrupt acknowledge cycle, in which A16–A19 are high, applies to all the
microprocessors described in this manual. The MC68010 defines an additional type of
CPU space cycle, the breakpoint acknowledge cycle, in which A16–A19 are all low. Other
configurations of A16–A19 are reserved by Motorola to define other types of CPU cycles
used in other M68000 Family microprocessors. Figure 5-10 shows the encoding of CPU
space addresses.
BREAKPOINT
ACKNOWLEDGE
(MC68010 only)
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
1 11 111 111 11 111 111 1 1 111 111 111
11
1
11
1
INTERRUPT
ACKNOWLEDGE
FUNCTION
CODE
20
31
23
19
16
0
CPU SPACE
TYPE FIELD
LEVEL
1
31 0
ADDRESS BUS
Figure 5-10. CPU Space Address Encoding
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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相關(guān)代理商/技術(shù)參數(shù) |
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