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CHAPTER 1 INTRODUCTION
48
User’s Manual U15109EJ3V0UD
(j)
Serial interfaces (SIO)
The V850/SC2 includes four kinds of serial interfaces: an asynchronous serial interface (UARTm), a 3-
wire serial I/O (CSIn), and an I
2
C bus interface (I
2
Cx), which can use up to eight channels at the same
time. Two of these channels are switchable between the UART and CSI and another two are switchable
between CSI and I
2
C.
For UARTm, data is transferred via the TXDm and RXDm pins.
For CSIn, data is transferred via the SOn, SIn, and SCKn pins.
For I
2
Cx, data is transferred via the SDAx and SCLx pins.
For UART and CSI4, a dedicated baud rate generator is provided.
Remark
m = 0 to 3
n = 0, 2 to 6
x = 0, 1
(k) A/D converter
This high-speed, high-resolution 10-bit A/D converter includes 12 analog input pins. Conversion is
performed using the successive approximation method.
(l)
DMA controller
A six-channel DMA controller is incorporated. This controller transfers data between the internal RAM
and on-chip peripheral I/O devices in response to interrupt requests sent by on-chip peripheral I/O.
(m) Ports
As shown below, the following ports have general-purpose port functions and control pin functions.
Port
I/O
Port Function
Control Function
Port 0
8-bit I/O
NMI, external interrupt, A/D converter trigger
Port 1
8-bit I/O
Serial interface, timer I/O
Port 2
8-bit I/O
Serial interface, timer I/O, IEBus data I/O
Port 3
8-bit I/O
Timer I/O, external address bus, external interrupt
Port 4
8-bit I/O
Port 5
8-bit I/O
External address/data bus
Port 6
6-bit I/O
External address bus
Port 7
8-bit input
Port 8
4-bit input
A/D converter analog input
Port 9
7-bit I/O
External bus interface control signal I/O
Port 10
8-bit I/O
Timer I/O, key return input, external address bus
Port 11
8-bit I/O
Wait control, external address bus
Port 12
8-bit I/O
Serial interface, timer output
Port 13
4-bit I/O
−
Port 14
8-bit I/O
Serial interface, timer input
Port 15
8-bit I/O
Serial interface, timer I/O
Port 17
7-bit I/O
General-
purpose port
V
DD0
= 4.5 V monitor output
(n) IEBus controller
The IEBus controller is a small digital data transmission system for transferring data between units and
is incorporated in the V850/SC2 only.