
86
Chapter 3
CPU Function
User’s Manual U16702EE3V2UD00
3.4.7 Cautions
(1)
Registers to be set first
Be sure to set the following registers first when using the V850E/RS1.
•
System wait control register (VSWC)
•
On-chip Debug Mode control register (OCDM)
•
Watchdog timer mode register 2 (WDTM2)
After setting the VSWC, OCDM, and WDTM2 registers, set the other registers as necessary.
When using the external bus, set each pin to the alternate-function bus control pin mode by using the
port-related registers after setting the above registers.
(2)
Area access time (VSWC) and On chip debug mode control register (OCDM)
(a) System wait control register (VSWC)
The system wait control register (VSWC) controls wait of bus access to the internal peripheral I/O
registers.
Three clocks are required to access an internal peripheral I/O register (without a wait cycle). The
V850E/RS1 requires wait cycles according to the operating frequency. Set the following value to
the VSWC register in accordance with the frequency used.
The VSWC register can be read or written in 8-bit units.
Figure 3-25:
System Wait Control Register (VSWC) Format
Caution:
Only select a value that corresponds to a supported operating frequency.
Symbol
7
6
5
4
3
2
1
0
Address
After reset
VSWC
0
SUWL2 SUWL1 SUWL0
0
VSWL2
VSWL1
VSWL0
FFFFF06EH
77H
R/W
R
R/W
R/W
R/W
R
R/W
R/W
R/W
Operation Frequency (f
XX
)
VSWC setting
4 MHz
≤ φ ≤
25 MHz
11H
25 MHz
≤ φ ≤
33 MHz
12H
33 MHz
≤ φ ≤
40 MHz
14H
electronic components distributor
Содержание V850E/RS1
Страница 6: ...6 User s Manual U16702EE3V2UD00 Downloaded from Elcodis com electronic components distributor...
Страница 206: ...206 User s Manual U16702EE3V2UD00 MEMO Downloaded from Elcodis com electronic components distributor...
Страница 232: ...232 User s Manual U16702EE3V2UD00 MEMO Downloaded from Elcodis com electronic components distributor...
Страница 366: ...366 User s Manual U16702EE3V2UD00 MEMO Downloaded from Elcodis com electronic components distributor...
Страница 402: ...402 User s Manual U16702EE3V2UD00 MEMO Downloaded from Elcodis com electronic components distributor...
Страница 684: ...684 User s Manual U16702EE3V2UD00 MEMO Downloaded from Elcodis com electronic components distributor...
Страница 766: ...766 User s Manual U16702EE3V2UD00 MEMO Downloaded from Elcodis com electronic components distributor...
Страница 798: ...798 User s Manual U16702EE3V2UD00 MEMO Downloaded from Elcodis com electronic components distributor...
Страница 832: ...832 User s Manual U16702EE3V2UD00 MEMO Downloaded from Elcodis com electronic components distributor...
Страница 834: ...834 User s Manual U16702EE3V2UD00 MEMO Downloaded from Elcodis com electronic components distributor...
Страница 848: ...848 User s Manual U16702EE3V2UD00 Downloaded from Elcodis com electronic components distributor...
Страница 852: ...Downloaded from Elcodis com electronic components distributor...