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
文件頁數(shù): 63/133頁
文件大?。?/td> 944K
代理商: MC68CK338CPV14
MC68CK338
MOTOROLA
MC68CK338TS/D
35
ADDR[23:11] — Base Address Field
This field sets the starting address of a particular chip-select’s address space. The address compare
logic uses only the most significant bits to match an address within a block. The value of the base ad-
dress must be a multiple of the block size. The base address register diagrams above show how register
bits correspond to CPU address lines.
BLKSZ[2:0] — Block Size Field
This field determines the size of the block that must be enabled by the chip-select. Table 23 shows bit
encoding for the base address registers block size field.
3.6.4 Option Registers
The option registers contain eight fields that determine timing of and conditions for assertion of chip-
select signals. To assert a chip-select signal, and to provide DSACK or autovector support, other con-
straints set by fields in the option register and in the base address register must also be satisfied.
CSBAR[0:10] — Chip-Select Base Address Registers
$YFFA4C–$YFFA74
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
ADDR
23
ADDR
22
ADDR
21
ADDR
20
ADDR
19
ADDR
18
ADDR
17
ADDR
16
ADDR
15
ADDR
14
ADDR
13
ADDR
12
ADDR
11
BLKSZ[2:0]
RESET:
0
Table 23 Block Size Field Bit Encoding
Block Size
Field
Block Size
Address Lines Compared
000
2 Kbyte
ADDR[23:11]
001
8 Kbyte
ADDR[23:13]
010
16 Kbyte
ADDR[23:14]
011
64 Kbyte
ADDR[23:16]
100
128 Kbyte
ADDR[23:17]
101
256 Kbyte
ADDR[23:18]
110
512 Kbyte
ADDR[23:19]
111
1 Mbyte
ADDR[23:20]
CSORBT — Chip-Select Option Register Boot ROM
$YFFA4A
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
MODE
BYTE[1:0]
R/W[1:0]
STRB
DSACK[3:0]
SPACE[1:0]
IPL[2:0]
AVEC
RESET:
0
1
0
1
0
1
0
CSOR[0:10] — Chip-Select Option Registers
$YFFA4E–YFFA76
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
MODE
BYTE[1:0]
R/W[1:0]
STRB
DSACK[3:0]
SPACE[1:0]
IPL[2:0]
AVEC
RESET:
0
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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