參數(shù)資料
型號: μPD78F9177Y
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(jī)微控制器(8位單片微控制器)
文件頁數(shù): 73/150頁
文件大小: 653K
代理商: ΜPD78F9177Y
Preliminary Product Information
71
μ
PD78F9177Y
(d) Baud rate generator control register 20 (BRGC20)
BRGC20 is used to specify the serial clock for serial interface 20.
BRGC20 is manipulated using an 8-bit memory manipulation instruction.
A RESET input clears BRGC20 to 00H.
Figure 6-36. Format of Baud Rate Generator Control Register 20
TPS203
0
0
0
0
0
0
0
0
1
3-bit counter source clock selection
TPS203 TPS202 TPS201 TPS200
0
0
0
0
BRGC20
Symbol
Address
When reset
R/W
FF73H
00H
R/W
7
6
5
4
3
2
1
0
TPS202
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 ASCK20 pin
Note
Not to be set
(2.5 MHz)
(1.25 MHz)
(625 kHz)
(313 kHz)
(156 kHz)
(78.1 kHz)
(39.1 kHz)
(19.5 kHz)
Other settings
TPS201
0
0
1
1
0
0
1
1
0
TPS200
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 BRGC20 during communication adversely affects the output of the
baud rate generator, thus hampering normal operation. Therefore, do not write to BRGC20
during communication.
Do not select n = 1 during operation at f
X
= 5.0 MHz, as n = 1 causes the rated baud rate to be
exceeded.
When the external input clock is selected, set port mode register 2 (PM2) in input mode.
2.
3.
Remarks 1.
f
X
: Main system clock oscillation frequency
2.
The parenthesized values apply to operation at f
X
= 5.0 MHz.
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