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R01UH0336EJ0102 Rev.1.02
Page 1219 of 1538
Jul 17, 2014
V850E2/PG4-L
Section 22 Synchronous/Asynchronous Serial Interface H (UARTH)
(3)
URTHnCTL2 – UARTHn Control Register 2
This register defines the baud rate for serial data transfer by UARTHn.
Access
This register can be read/written in 16-bit units.
Address
<URTHn_base0> + 44
H
Initial value
EFFF
H
This register is initialized by a reset from any source.
Caution
Writing to this register is only allowed while the operation of UARTHn is
disabled (URTHnCTL0.URTHnPW = 0).
Clock supply
The value of the UARTHn input clock is defined in Table 22-3, UARTHn Clock
Supply.
15
14
13
12
11
10
9
8
URTHnPRS[2:0]
0
URTHnBRS[11:8]
R/W
R/W
R/W
R
R/W
R/W
R/W
R/W
7
6
5
4
3
2
1
0
URTHnBRS[7:0]
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Table 22-10
URTHnCTL2 Register Contents
Bit Position
Bit Name
Function
15 to 13
URTHnPRS
[2:0]
Prescaler clock (PRSCLK) division value
0: PRSCLK = PCLK/2
0
1: PRSCLK = PCLK/2
1
2: PRSCLK = PCLK/2
2
3: PRSCLK = PCLK/2
3
4: PRSCLK = PCLK/2
4
5: PRSCLK = PCLK/2
5
6: PRSCLK = PCLK/2
6
7: PRSCLK = PCLK/2
7
11 to 0
URTHnBRS
[11:0]
Baud-rate clock (BRCLK) division value
URTHn
BRS[11:0]
Transmit/Receive BRCLK
BF Receive Clock
000
H
PRSCLK/(2
2)
PRSCLK/2
001
H
002
H
003
H
PRSCLK/(2
3)
PRSCLK/3
004
H
PRSCLK/(2
4)
PRSCLK/4
005
H
PRSCLK/(2
5)
PRSCLK/5
...
PRSCLK/
(2
URTHnBRS[11:0])
PRSCLK/
URTHnBRS[11:0]
FFE
H
PRSCLK/(2
4094)
PRSCLK/4094
FFF
H
PRSCLK/(2
4095)
PRSCLK/4095
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