參數(shù)資料
型號(hào): Z86C44
廠商: ZiLOG, Inc.
英文描述: CMOS Z8 MCU(CMOS Z8系列微控制器)
中文描述: 單片機(jī)的CMOS Z8的CMOS(Z8系列微控制器)
文件頁數(shù): 53/70頁
文件大?。?/td> 1192K
代理商: Z86C44
Z86C34/C35/C36/C44/C45/C46
CMOS Z8 MCUs with ASCI UART
ZiLOG
DS007601-Z8X0499
P R E L I M I N A R Y
53
ASCI TIME CONSTANT REGISTER (ASTL)
(%(A)06H: READ/WRITE)
ASCI TIME CONSTANT REGISTER (ASTH)
(%(A)07H: READ/WRITE)
The
ASTL
and
ASTH
registers are only used when the
BRG
mode bit in the
ASEXT
register is set to a
1
. These two 8-
bit registers form a 16-bit counter with a flip-flop logic cir-
cuit (
DIVIDE-BY-2
) on the output so that the final BRG out-
put is symmetrical. The values written to these registers de-
termine the time constant from which the baud rate is
generated.
Table 24. ASTL Register Bit Functions
Bit
7
6
5
4
3
2
1
0
R
ASCI Time Constant Low
W
Reset
1
1
1
1
1
1
1
1
Table 25. ASTH Register Bit Functions
Bit
7
6
5
4
3
2
1
0
R
ASCI Time Constant High
W
Reset
1
1
1
1
1
1
1
1
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