V104
Chapter 1: Introduction
1-1
Chapter 1:
Introduction
1.1
Functional Description
The V104 from TERN is a low cost, high performance, C/C++ programmable, 16-bit microprocessor core
module. It is designed for embedded applications that require compactness, low power consumption, and
high reliability. The V104 can be integrated into an OEM product as a processor core component. It also
can be used to build a smart sensor, or as a node in a distributed microprocessor system.
Int SRAM
(512 bytes)
Ser0
Ser1
Time Base Counter
16-Bit Timers (2)
Port T with 8 Comparators
Ext. Interrupts (5)
16-bit counter/DMA (2)
Digital I/O Ports (3)
HLDRQ/AK
MAX691
Supervisor
EEPROM
up to 2K
SCL
SDA
P00
P01
P03
NMI
RST
PFO
VRAM
V104
16-bit C/C++
Controller
Data
Addr
Cntl
*
EPROM/Flash
(0xf0000-0xfffff, memory)
SRAM
(0-0x7ffff, memory)
UART SCC2691
(0xc000-0xffff, I/O)
RTC72421
(0x8000-0xbfff, I/O)
*
*
U2
U3
U1
U8
U4
U6
U7
HWD
/RESET
V25
CPU
80x86/8088
Compatible
TLC2543
U10
PPI 82c55
bi-directional 24 I/Os
11 ch. 12-bit ADC
INT1/INT2/NMI
4-bit ADC
Analog or
Digital
I/O
TTL inputs
MAX537
4 ch. 12-bit DAC
U12
PC/104 bus
LCD interface
Figure 1.1 Functional block diagram of the V104
Measuring 4.0 x 3.5 x 0.5 inches, the V104 offers a complete C/C++ programmable computer system with a
16-bit high performance CPU (NEC V25) and operates at 8 MHz with zero-wait-states. Optional features
include up to 512K EPROM/Flash and up to 512K battery-backed SRAM. A 512-byte serial EEPROM is
included on-board. An optional real-time clock provides information on the year, month, date, hour, minute,
second, and 1/64 second, and an interrupt signal.
Two DMA-driven serial ports from the NEC V25 support high-speed, reliable serial communication at a
rate of up to 115,200 baud. An optional UART SCC2691 may be added in order to have a third UART on-
board. All three serial ports support 8-bit and 9-bit communication.
The optional 12-bit ADC has 11 channels of analog inputs with sample-and-hold and a high-impedance
reference input (2.5-5V) that facilitate ratiometric conversion, scaling, and isolation of analog circuitry from
logic and supply noise.
The optional 4-channel 12-bit DAC voltage outputs (0V to 2.5V) are internally buffered by precision unity-
gain followers with a typical slew rate of 3V/
µ
s with 5 K
Ω
load. It must be installed with a precision
reference voltage (included) and requires a -5V external power supply.