參數(shù)資料
型號: MC68334GVFC20
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 20 MHz, MICROCONTROLLER, PQFP132
封裝: PLASTIC, QFP-132
文件頁數(shù): 32/76頁
文件大小: 444K
代理商: MC68334GVFC20
MOTOROLA
MC68334
38
MC68334TS/D REV. 1
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.
3.7.2 Functions of Pins for Other Modules During Reset
Generally, pins associated with modules other than the SIM default to port functions, and input/output
ports are set to input state. This is accomplished by disabling pin functions in the appropriate control
registers, and by clearing the appropriate port data direction registers. Refer to individual module sec-
tions in this manual for more information. The following table is a summary of module pin function out
of reset.
3.7.3 Reset Timing
The RESET input must be asserted for a specified minimum period in order for reset to occur. External
RESET assertion can be delayed internally for a period equal to the longest bus cycle time (or the bus
monitor time-out period) in order to protect write cycles from being aborted by reset. While RESET is
asserted, SIM pins are either in a disabled high-impedance state or are driven to their inactive states.
Table 21 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
DSACK0, DSACK1,
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
Table 22 Module Pin Functions
Module
Pin Mnemonic
Function
CPU32
DSI/IFETCH
DSO/IPIPE
BKPT/DSCLK
TPU
TPUCH[15:0]
TPU Input
T2CLK
TCR2 Clock
ADC
AN[6:0]/PADA[6:0]
Analog Input
相關(guān)PDF資料
PDF描述
MC68334GCFC20 32-BIT, 20 MHz, MICROCONTROLLER, PQFP132
MC68334MFC20 32-BIT, 20 MHz, MICROCONTROLLER, PQFP132
MC68334VFC20 32-BIT, 20 MHz, MICROCONTROLLER, PQFP132
MC68334AVFC20 32-BIT, 20 MHz, MICROCONTROLLER, PQFP132
MC68334VFC16 32-BIT, 16 MHz, MICROCONTROLLER, PQFP132
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