参数资料
型号: MC68331CEH16
厂商: Freescale Semiconductor
文件页数: 24/84页
文件大小: 0K
描述: IC MCU 32BIT 16MHZ 132-PQFP
标准包装: 36
系列: M683xx
核心处理器: CPU32
芯体尺寸: 32-位
速度: 16MHz
连通性: EBI/EMI,SCI,SPI,UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 18
程序存储器类型: ROMless
电压 - 电源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 132-BQFP 缓冲式
包装: 托盘
产品目录页面: 733 (CN2011-ZH PDF)
30
MC68331TS/D
3.5.2 Pin Assignment Registers
The pin assignment registers (CSPAR0 and CSPAR1) contain pairs of bits that determine the function
of chip-select pins. The pin assignment encodings used in these registers are shown below.
CSPAR0 contains seven 2-bit fields that determine the functions of corresponding chip-select pins.
CSPAR0[15:14] are not used. These bits always read zero; writes have no effect. CSPAR0 bit 1 always
reads one; writes to CSPAR0 bit 1 have no effect.
CSPAR1 contains five 2-bit fields that determine the functions of corresponding chip-select pins.
CSPAR1[15:10] are not used. These bits always read zero; writes have no effect.
Table 12 Pin Assignment Encodings
Bit Field
Description
00
Discrete Output
01
Alternate Function
10
Chip Select (8-Bit Port)
11
Chip Select (16-Bit Port)
CSPAR0 —Chip Select Pin Assignment Register 0
$YFFA44
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
CSPA0[6]
CSPA0[5]
CSPA0[4]
CSPA0[3]
CSPA0[2]
CSPA0[1]
CSBOOT
RESET:
0
DATA2
1
DATA2
1
DATA2
1
DATA1
1
DATA1
1
DATA1
1
DATA0
Table 13 CSPAR0 Pin Assignments
CSPAR0 Field
Chip Select Signal
Alternate Signal
Discrete Output
CSPA0[6]
CS5
FC2
PC2
CSPA0[5]
CS4
FC1
PC1
CSPA0[4]
CS3
FC0
PC0
CSPA0[3]
CS2
BGACK
CSPA0[2]
CS1
BG
CSPA0[1]
CS0
BR
CSBOOT
——
CSPAR1 —Chip Select Pin Assignment Register 1
$YFFA46
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
CSPA1[4]
CSPA1[3]
CSPA1[2]
CSPA1[1]
CSPA1[0]
RESET:
0
DATA7
1
DATA
[7:6]
1
DATA
[7:5]
1
DATA
[7:4]
1
DATA
[7:3]
1
Table 14 CSPAR1 Pin Assignments
CSPAR0 Field
Chip Select Signal
Alternate Signal
Discrete Output
CSPA1[4]
CS10
ADDR23
ECLK
CSPA1[3]
CS9
ADDR22
PC6
CSPA1[2]
CS8
ADDR21
PC5
CSPA1[1]
CS7
ADDR20
PC4
CSPA1[0]
CS6
ADDR19
PC3
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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