參數(shù)資料
型號: μPD789405
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8位單片微控制器)
中文描述: 8位單片機微控制器(8位單片微控制器)
文件頁數(shù): 71/128頁
文件大?。?/td> 607K
代理商: ΜPD789405
71
μ
PD789405, 789406, 789407
(4) Baud rate generator control register (BRGC)
The BRGC is used to specify the serial clock for serial interface channel 0.
The BRGC is set using an 8-bit memory manipulation instruction.
A RESET input clears the BRGC to 00H.
Figure 5-35. Baud Rate Generator Control Register Format
TPS3
0
0
0
0
0
0
0
0
1
3-bit counter source clock selection
TPS3 TPS2 TPS1 TPS0
0
0
0
0
BRGC
Symbol
Address
When reset
R/W
FF73H
00H
R/W
7
6
5
4
3
2
1
0
TPS2
0
0
0
0
1
1
1
1
0
f
X
/2
f
X
/2
2
f
X
/2
3
f
X
/2
4
f
X
/2
5
f
X
/2
6
f
X
/2
7
f
X
/2
8
External clock pulse input at the ASCK pin
Note
Not to be specified
(2.5 MHz)
(1.25 MHz)
(625 kHz)
(313 kHz)
(156 kHz)
(78.1 kHz)
(39.1 kHz)
(19.5 kHz)
Other settings
TPS1
0
0
1
1
0
0
1
1
0
TPS0
0
1
0
1
0
1
0
1
0
n
1
2
3
4
5
6
7
8
Note
An external clock can be used only in UART mode.
Cautions 1. Any attempt to write to the BRGC during communication adversely affects the output of the
baud rate generator, thus hampering normal operation. Therefore, do not write to the
BRGC during communication.
2. Do not select n = 1 during operation at f
X
= 5.0 MHz, as n = 1 causes the rated baud rate to
be exceeded.
Remarks 1.
f
X
: Main system clock oscillation frequency
2.
n : Value specified in TPS0 to TPS3 (1
n
8)
3.
The parenthesized values apply to operation at f
X
= 5.0 MHz.
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