104
Chapter 3
CPU System Functions
Preliminary User’s Manual U17566EE1V2UM00
3.1.1
Description
The figure below shows a block diagram of the microcontroller, focusing on the
CPU and modules that interact with the CPU directly.
Table 3-1
lists the bus
types.
Figure 3-1
CPU system
The shaded busses are used for accessing the configuration registers of the
concerned modules.
Progr
a
m co
u
nter
Gener
a
l-p
u
rpo
s
e
regi
s
ter
s
M
u
ltiplier
(
3
2
×
3
2
→
64)
ALU
B
a
rrel
s
hifter
CPU
V
S
B
DMA control
u
nit
(DMAC)
S
y
s
tem controller
B
us
b
ridge
(BBR)
In
s
tr
u
ction
qu
e
u
e
B
us
control
u
nit
(BCU)
NPB
V
D
B
V
F
B
S
y
s
tem regi
s
ter
s
RCU interf
a
ce
S
t
a
nd
b
y control
u
nit
(
S
TBC)
Interr
u
pt control
u
nit
(INTC)
Table 3-1
Bus types
Bus type
Function
NPB – NEC Peripheral Bus
Bus interface to the peripherals (internal bus).
VSB – V850 System Bus
Bus interface to the Memory Controller for access to external memory, additional
internal memory and to the NPB bus bridge BBR.
VFB – V850 Fetch Bus
Interface to the internal ROM (mask ROM or flash ROM).
VDB – V850 Data Bus
Interface to the internal RAM.
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