M-V850E-IA4 Renesas Electronics America, M-V850E-IA4 Datasheet - Page 82

• Manufacturer Part Number: M-V850E-IA4
• Description: KIT EVAL V850E IA4 UPD70F3186
• Manufacturer: Renesas Electronics America

Specifications of M-V850E-IA4

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3.4.9
V850E/IA3 and V850E/IA4, a wait set by the VSWC register is required in addition to those 3 clocks. Set 13H (set
wait for 4 clocks) to VSWC.
3.4.10 Cautions
and
80
The VSWC register is a register that controls the bus access wait for the on-chip peripheral I/O registers.
Access to on-chip peripheral I/O registers of the V850E1 CPU core is basically made in 3 clocks; however, in the
This register can be read or written in 8-bit units (address: FFFFF06EH, initial value: 77H).
Caution When using the V850E/IA3 and V850E/IA4, the VSWC register must be set first.
Remark
Use the processing in either (1) or (2) below to set the internal RAM size to 6 KB in the
(1) Compile using the DF703183 (V850E/IA3) or DF703185 (V850E/IA4) device file.
(2) Change the description of the address immediately after the SIDATA and DATA labels in the link directive file
Remark
μ
PD70F3186 (V850E/IA4).
as follows.
[Description example]
System wait control register (VSWC)
SIDATA
DATA
Set other registers if necessary after setting the VSWC register.
When a register includes status flags that indicate the statuses of the on-chip peripheral functions
(register such as STATUS1n) or a register that indicates the count value of a timer (such as TMENC1n)
is accessed, a register access retry operation takes place if the timing at which the flag and count value
changes and the timing of the register access overlap. Consequently, access to the on-chip peripheral
I/O register may take a long time.
When using a partner manufacturer’s tool, define so that the area used by the internal RAM does not
exceed the range from FFFD800H to FFFEFFFH in the file equivalent to the link directive file.
: !LOAD ?RW V0fffd800
: !LOAD ?RW V0fffd900
:
:
CPU Clock Frequency (f
500 kHz ≤ f
CHAPTER 3 CPU FUNCTION
User’s Manual U16543EJ4V0UD
CPU
≤ 64 MHz
← V0fffd800 is the internal RAM start address
← V0fffd900 is the internal RAM start address + 100 addresses
CPU
)
VSWC Set Value
13H
μ
PD70F3184 (V850E/IA3)