参数资料
型号: MC68332GVFV20
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 20 MHz, MICROCONTROLLER, PQFP144
封装: 20 X 20 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, LQFP-144
文件页数: 34/109页
文件大小: 787K
代理商: MC68332GVFV20
MOTOROLA
MC68332
30
MC68332TS/D
Chip-select assertion can be synchronized with bus control signals to provide output enable, read/write
strobes, or interrupt acknowledge signals. Logic can also generate DSACK signals internally. A single
DSACK generator is shared by all circuits. Multiple chip selects assigned to the same address and con-
trol must have the same number of wait states.
Chip selects can also be synchronized with the ECLK signal available on ADDR23.
When a memory access occurs, chip-select logic compares address space type, address, type of ac-
cess, transfer size, and interrupt priority (in the case of interrupt acknowledge) to parameters stored in
chip-select registers. If all parameters match, the appropriate chip-select signal is asserted. Select sig-
nals are active low. Refer to the following block diagram of a single chip-select circuit.
Figure 9 Chip-Select Circuit Block Diagram
The following table lists allocation of chip-selects and discrete outputs on the pins of the MCU.
Pin
Chip Select
Discrete Outputs
CSBOOT
BR
CS0
BG
CS1
BGACK
CS2
FC0
CS3
PC0
FC1
CS4
PC1
FC2
CS5
PC2
ADDR19
CS6
PC3
ADDR20
CS7
PC4
ADDR21
CS8
PC5
ADDR22
CS9
PC6
ADDR23
CS10
ECLK
CHIP SEL BLOCK
AVEC
GENERATOR
DSACK
GENERATOR
PIN
ASSIGNMENT
REGISTER
PIN
DATA
REGISTER
BASE ADDRESS REGISTER
TIMING
AND
CONTROL
ADDRESS COMPARATOR
OPTION COMPARE
OPTION REGISTER
AVEC
DSACK
PIN
BUS CONTROL
INTERNAL
SIGNALS
ADDRESS
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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