參數(shù)資料
型號(hào): MC68HC000CEI8
廠商: Freescale Semiconductor
文件頁(yè)數(shù): 131/189頁(yè)
文件大小: 0K
描述: IC MPU 16BIT 8MHZ 68-PLCC
標(biāo)準(zhǔn)包裝: 18
系列: M680x0
處理器類型: M680x0 32-位
速度: 8MHz
電壓: 3.3V,5V
安裝類型: 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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4- 8
M68000 8-/16-/32-BIT MICROPROCESSORS USER'S MANUAL
MOTOROLA
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 LDS or DS. 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,
LDS , and DS. 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.
4.2 OTHER BUS OPERATIONS
Refer to Section 5 16-Bit Bus Operations for information on the following items:
CPU Space Cycle
Bus Arbitration
— Bus Request
— Bus Grant
— Bus Acknowledgment
Bus Control
Bus Errors and Halt Operations
Reset Operations
Asynchronous Operations
Synchronous Operations
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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