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| 型號(hào)： | MC68HC001EI16 |
| 廠商： | Freescale Semiconductor |
| 文件頁(yè)數(shù)： | 171/189頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC MPU 16BIT 16MHZ 68-PLCC |
| 標(biāo)準(zhǔn)包裝： | 18 |
| 系列： | M680x0 |
| 處理器類(lèi)型： | M680x0 32-位 |
| 速度： | 16MHz |
| 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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5- 36
M68000 8-/16-/32-BIT MICROPROCESSORS USER'S MANUAL
MOTOROLA
is the maximum hold time for a low on R/W beyond the initiation of the read
cycle.
STATE 1
Entering S1, a low period of the clock, the address of the accessed device
is driven externally with an assertion delay defined by parameter #6.
STATE 2
On the rising edge of S2, a high period of the clock, AS is asserted. During
a read cycle, UDS, LDS, and/or DS is also asserted at this time. Parameter
#9 defines the assertion delay for these signals. For a write cycle, the R/W
signal is driven low with a delay defined by parameter #20.
STATE 3
On the falling edge of the clock entering S3, the data bus is driven out of
the high-impedance state with the data being written to the accessed
device (in a write cycle). Parameter #23 specifies the data assertion delay.
In a read cycle, no signal is altered in S3.
STATE 4
Entering the high clock period of S4, UDS, LDS, and/or DS is asserted
(during a write cycle) on the rising edge of the clock. As in S2 for a read
cycle, parameter #9 defines the assertion delay from the rising edge of S4
for UDS, LDS, and/or DS. In a read cycle, no signal is altered by the
processor during S4.
Until the falling edge of the clock at the end of S4 (beginning of S5), no
response from any external device except RESET is acknowledged by the
processor. If either DTACK or BERR is asserted before the falling edge of
S4 and satisfies the input setup time defined by parameter #47, the
processor enters S5 and the bus cycle continues. If either DTACK or BERR
is asserted but without meeting the setup time defined by parameter #47,
the processor may recognize the signal and continue the bus cycle; the
result is unpredictable. If neither DTACK nor BERR is asserted before the
next rise of clock, the bus cycle remains in S4, and wait states (complete
clock cycles) are inserted until one of the bus cycle termination is met.
STATE 5
S5 is a low period of the clock, during which the processor does not alter
any signal.
STATE 6
S6 is a high period of the clock, during which data for a read operation is
set up relative to the falling edge (entering S7). Parameter #27 defines the
minimum period by which the data must precede the falling edge. For a
write operation, the processor changes no signal during S6.
STATE 7
On the falling edge of the clock entering S7, the processor latches data
and negates AS and UDS, LDS, and/or DS during a read cycle. The hold
time for these strobes from this falling edge is specified by parameter #12.
The hold time for data relative to the negation of AS and UDS, LDS, and/or
DS is specified by parameter #29. For a write cycle, only AS and UDS, LDS,
and/or DS are negated; timing parameter #12 also applies.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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| MC68HC001EI8 | 功能描述:微處理器 - MPU 16-BIT MPU RoHS:否 制造商:Atmel 處理器系列:SAMA5D31 核心:ARM Cortex A5 數(shù)據(jù)總線寬度:32 bit 最大時(shí)鐘頻率:536 MHz 程序存儲(chǔ)器大小:32 KB 數(shù)據(jù) RAM 大小:128 KB 接口類(lèi)型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作電源電壓:1.8 V to 3.3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FBGA-324 |
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