参数资料
型号: ATWEBDVK-02RC
厂商: Atmel
文件页数: 49/137页
文件大小: 0K
描述: KIT DEV TCP/IP AT89C51RD2 REMOTE
标准包装: 1
系列: @Web
主要目的: *
嵌入式: *
已用 IC / 零件: AT89C51RD2
主要属性: *
次要属性: *
已供物品: 板,带远程控制器模块和软件
产品目录页面: 617 (CN2011-ZH PDF)
19
4235K–8051–05/08
AT89C51RD2/ED2
Reset Value = 0000 000’HSB. X2’b (See “Hardware Security Byte”)
Not bit addressable
Table 7-2.
CKCON1 Register
CKCON1 - Clock Control Register (AFh)
5
PCAX2
Programmable Counter Array Clock
(This control bit is validated when the CPU clock X2 is set; when X2 is low, this bit has no
effect).
Cleared to select 6 clock periods per peripheral clock cycle. Set to select 12 clock
periods per peripheral clock cycle.
4
SIX2
Enhanced UART Clock (Mode 0 and 2)
(This control bit is validated when the CPU clock X2 is set; when X2 is low, this bit has no
effect).
Cleared to select 6 clock periods per peripheral clock cycle. Set to select 12 clock
periods per peripheral clock cycle.
3
T2X2
Timer2 Clock
(This control bit is validated when the CPU clock X2 is set; when X2 is low, this bit has no
effect).
Cleared to select 6 clock periods per peripheral clock cycle.
Set to select 12 clock periods per peripheral clock cycle.
2
T1X2
Timer1 Clock
(This control bit is validated when the CPU clock X2 is set; when X2 is low, this bit has no
effect).
Cleared to select 6 clock periods per peripheral clock cycle. Set to select 12 clock
periods per peripheral clock cycle.
1
T0X2
Timer0 Clock
(This control bit is validated when the CPU clock X2 is set; when X2 is low, this bit has no
effect).
Cleared to select 6 clock periods per peripheral clock cycle. Set to select 12 clock
periods per peripheral clock cycle.
0
X2
CPU Clock
Cleared to select 12 clock periods per machine cycle (STD mode) for CPU and all the
peripherals. Set to select 6 clock periods per machine cycle (X2 mode) and to enable the
individual peripherals’X2’ bits. Programmed by hardware after Power-up regarding
Hardware Security Byte (HSB), Default setting, X2 is cleared.
7
6
5
4
3
2
1
0
-
SPIX2
Bit
Number
Bit
Mnemonic
Description
7
-
Reserved
6
-
Reserved
5
-
Reserved
4
-
Reserved
3
-
Reserved
Bit
Number
Bit
Mnemonic
Description
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