IA70C20 Datasheet, PDF (7/27 Pages) InnovASIC, Inc – 8-Bit Microcontroller

IA70C20
8-Bit Microcontroller
Data Sheet
August 19, 2008
2.4 Port C
In single-chip mode, Port C is an 8-bit bi-directional port in which each pin may be individually set to
be either an input or an output under the control of software. In all other modes, Port C becomes a
multiplexed address/data port for the off-chip memory bus providing the least significant byte of a 16-
bit address.
2.5 Port D
In either single-chip or peripheral expansion mode, Port D is an 8-bit bi-directional port in which each
pin may be individually set to be either an input or an output under the control of software. In either
full expansion or microprocessor mode, Port D contains the most significant byte of the 16-bit address.
2.6 Interrupt Controller
There are four interrupt levels INT0-INT3, with INT0 having the highest priority. This block receives
the external interrupt and alerts the CPU, enabling servicing of the interrupt. The interrupts are synced
to the positive edge of x2_div_2, the divided clock.
2.7 Clock Controller
Generates two enable pulse signals, one at ½ x2, and one at 1/16 x2, to clock internal registers at
varying speeds.
2.8 Perf File
Contains register file registers, data holding registers, and peripheral registers for port operations.
2.9 Timer
A programmable timer/event counter. It is an 8 bit modulo-n counter with a programmable pre-scaled
clock source. INT2 is an internal interrupt used by the timers.
2.10 ROM
Customer specific 2K X 8 instruction ROM.
IA211030117-05
Page 7 of 27
http://www.Innovasic.com
Customer Support:
1-888-824-4184