C8051F206
C8051F220/1/6
C8051F230/1/6
11.片上XRAM ( C8051F206 /二百三十六分之二百二十六) ..................................... .................................... 81
图11.1 。 EMI0CN :外部存储器接口控制............................................ ............................... 81
12.复位源............................................................................................................ 82
图12.1 。复位源图............................................................................................................... 82
12.1.
上电复位................................................................................................................................. 83
12.2.
软件强制Reset....................................................................................................................... 83
图12.2 。 VDD监视器时序图.............................................. .................................................. .. 83
12.3.
掉电复位................................................................................................................................ 83
12.4.
外部复位................................................................................................................................... 84
12.5.
时钟丢失检测器复位........................................................................................................... 84
12.6.
比较器0 Reset........................................................................................................................... 84
12.7.
看门狗定时器Reset...................................................................................................................... 84
图12.3 。 WDTCN :看门狗定时器控制寄存器............................................ ................................. 85
图12.4 。 RSTSRC :复位源寄存器............................................. .................................................. 86
表12.1 。 VDD监视器电气特性.............................................. ........................................ 87
13 。 OSCILLATOR................................................................................................................... 88
图13.1 。振荡器Diagram...................................................................................................................... 88
图13.2 。 OSCICN :内部振荡器控制寄存器............................................ ............................... 89
表13.1 。内部振荡器的电气特性.............................................. .................................. 89
图13.3 。 OSCXCN :外部振荡器控制寄存器............................................ ............................. 90
13.1.
外部晶体Example.................................................................................................................. 91
13.2.
外部RC Example........................................................................................................................ 91
13.3.
外部电容Example.............................................................................................................. 91
14.端口输入/输出............................................ .................................................. ..... 92
14.1.
端口I / O初始化........................................................................................................................ 92
图14.1 。端口I / O功能框图........................................... ................................................. 93
图14.2 。端口I / O单元结构图...................................................................................................... 93
图14.3 。 PRT0MX :端口I / O MUX寄存器0 ......................................... ................................................. 94
图14.4 。 PRT1MX :端口I / O MUX寄存器1 ......................................... ................................................. 95
图14.5 。 PRT2MX :端口I / O MUX寄存器2 ......................................... ................................................. 95
14.2.
通用端口I / O .................................................................................................................. 96
图14.6 。 P0 : P0口注册....................................................................................................................... 96
图14.7 。 PRT0CF : P0口配置寄存器............................................. ......................................... 96
图14.8 。 P0MODE : P0口的数字/模拟输入模式.......................................... ................................... 97
图14.9 。 P1 :端口1注册....................................................................................................................... 97
图14.10 。 PRT1CF :端口1配置寄存器............................................. ....................................... 97
图14.11 。 P1MODE :端口1数字/模拟输入模式.......................................... ................................. 98
图14.12 。 P2 :端口2注册..................................................................................................................... 98
图14.13 。 PRT2CF :端口2配置寄存器............................................. ....................................... 98
图14.14 。 P2MODE :端口2数字/模拟输入模式.......................................... ................................. 99
图14.15 。 P3 :端口3寄存器* ................................................................................................................... 99
图14.16 。 PRT3CF :端口3配置寄存器* ............................................ ...................................... 99
图14.17 。 P3MODE :端口3数字/模拟输入模式* ......................................... .............................. 100
表14.1 。端口I / O直流电气特性........................................... ............................................ 100
15.串行外设接口总线............................................ .................... 101
图15.1 。 SPI框图................................................................................................................... 101
图15.2 。典型的SPI互联..................................................................................................... 102
15.1.
信号说明......................................................................................................................... 102
15.2.
Operation......................................................................................................................................... 103
图15.3 。全双工操作.............................................................................................................. 103
15.3.
串行时钟时序........................................................................................................................ 104
图15.4 。数据/时钟时序Diagram..................................................................................................... 104
15.4.
SPI特殊功能寄存器....................................................................................................... 105
图15.5 。 SPI0CFG : SPI配置寄存器............................................. ......................................... 105
第4页
CYGNAL集成产品公司
2002
9.2002 ;修订版1.2