參數(shù)資料
型號(hào): MC68CK338CPV14
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 14.4 MHz, MICROCONTROLLER, PQFP144
封裝: PLASTIC, TQFP-144
文件頁(yè)數(shù): 71/133頁(yè)
文件大小: 944K
代理商: MC68CK338CPV14
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MOTOROLA
MC68CK338
42
MC68CK338TS/D
Data lines have weak internal pull-up drivers. External bus loading can overcome the weak internal pull-
up drivers on data bus lines, and hold pins low during reset. Use an active device to hold data bus lines
low. Data bus configuration logic must release the bus before the first bus cycle after reset to prevent
conflict with external memory devices. The first bus cycle occurs ten CLKOUT cycles after RESET is
released. If external mode selection logic causes a conflict of this type, an isolation resistor on the driven
lines may be required.
3.8.2 Reset States of SIML Pins
Generally, while RESET is asserted, SIML pins either go to an inactive high-impedance state or are
driven to their inactive states. After RESET is released, mode selection occurs and reset exception pro-
cessing begins. Pins configured as inputs must be driven to the desired active state. Pull-up or pull-
down circuitry may be necessary. Pins configured as outputs begin to function after RESET is released.
Table 32 is a summary of SIML pin states during reset.
Table 31 Reset Mode Selection
Mode Select Pin
Default Function
(Pin Left High)
Alternate Function
(Pin Pulled Low)
DATA0
CSBOOT 16-Bit
CSBOOT 8-Bit
DATA1
CS0
CS1
CS2
BR
BG
BGACK
DATA2
CS3
CS4
CS5
FC0
FC1
FC2
DATA3
DATA4
DATA5
DATA6
DATA7
CS6
CS[7:6]
CS[8:6]
CS[9:6]
CS[10:6]
ADDR19
ADDR[20:19]
ADDR[21:19]
ADDR[22:19]
ADDR[23:19]
DATA8
DSACK[1:0]
AVEC, DS, AS
SIZ[1:0]
PORTE
DATA9
IRQ[7:1]
MODCLK
PORTF
DATA11
Test Mode Disabled
Test Mode Enabled
MODCLK
VCO = System Clock
EXTAL = System Clock
BKPT
Background Mode Disabled
Background Mode Enabled
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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