參數(shù)資料
型號： MC68CK338
廠商： Motorola, Inc.
元件分類： 32位微控制器
英文描述： Highly Integrated, Low-Power, 32-Bit Microcontroller
中文描述： 高度集成，低功耗，32位微控制器
文件頁數(shù)： 31/133頁
文件大?。?/td> 798K
代理商： MC68CK338
MC68CK338
MC68CK338TS/D
MOTOROLA
31
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. If a chip-select function is given the same address as a microcontroller module or
an internal memory array, an access to that address goes to the module or array, and the chip-select
signal is not asserted. The external address and data buses do not reflect the internal access.
All chip-select circuits except CSBOOT are disabled out of reset. Chip-select option registers must not
be written until base addresses have been written to the proper base address registers. Alternate func-
tions for chip-select pins are enabled if appropriate data bus pins are held low at the release of RESET.
Table 17
lists allocation of chip-selects and discrete outputs on the pins of the MCU.
3.6.1 Chip-Select Registers
Each chip-select pin can have one or more functions. Chip-select pin assignment registers CSPAR[0:1]
determine functions of the pins. Pin assignment registers also determine port size for dynamic bus al-
location. A pin data register (PORTC) latches data for chip-select pins that are used for discrete output.
Blocks of addresses are assigned to each chip-select function. Block sizes of two Kbytes to one Mbyte
can be selected by writing values to the appropriate base address registers CSBARBT and CS-
BAR[0:10]. Multiple chip-selects assigned to the same block of addresses must have the same number
of wait states.
Chip-select option registers CSORBT and CSOR[0:10] determine timing of and conditions for assertion
of chip-select signals. Eight parameters, including operating mode, access size, synchronization, and
wait state insertion can be specified.
Initialization software usually resides in a peripheral memory device controlled by the chip-select cir-
cuits. CSBOOT and registers CSORBT and CSBARBT are provided to support bootstrap operation.
3.6.2 Pin Assignment Registers
The pin assignment registers contain twelve 2-bit fields that determine functions of the chip-select pins.
Each pin has two or three possible functions, as shown in
Table 18
.
Table 17 Chip-Select and Discrete Output Allocation
Pin
Chip-Select
CSBOOT
CS0
CS1
CS2
CS3
CS4
CS5
CS6
CS7
CS8
CS9
CS10
Discrete Outputs
—
—
—
—
PC0
PC1
PC2
PC3
PC4
PC5
PC6
—
CSBOOT
BR
BG
BGACK
FC0
FC1
FC2
ADDR19
ADDR20
ADDR21
ADDR22
ADDR23
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