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Texas Instruments TMS320C2XX User Manual

Page 421

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’C209 Versus Other ’C2xx Devices

11-3

TMS320C209

-

Memory and I/O Spaces:

J

The I/O addresses of the peripheral registers are different on the
’C209.

J

The ’C209 does not support the ’C2xx HOLD operation.

-

Interrupts:

J

The ’C209 has four maskable interrupt lines, none of them shared.
The other devices have six interrupt lines, one shared by the INT2 and
INT3 pins.

J

The ’C209 does not have an interrupt control register (ICR) because
INT2 and INT3 have their own interrupt lines.

J

Although the interrupt flag register (IFR) and interrupt mask register
(IMR) are used in the same way on all ’C2xx device, the ’C209 has
fewer flag and mask bits because it does not have serial ports.

J

On the ’C209, interrupts INT2 and INT3 have their own interrupt lines
and, thus, have their own interrupt vectors. On other ’C2xx devices,
INT2 and INT3 share an interrupt line and, thus, share one interrupt
vector.

J

The ’C209 has an interrupt acknowledge pin (IACK), which allows ex-
ternal detection of when an interrupt has been acknowledged.

J

The ’C209 has two pins for reset: RS and RS; other ’C2xx devices
have only RS.

11.1.3 Where to Find the Information You Need About the TMS320C209

For information about:

Look here:

Assembly language instructions

Chapter 7,

Assembly Language

Instructions

Clock generator

Main description

Chapter 8,

On-Chip Peripherals

Options and configuration

Subsection 11.4.1 (page 11-14)

CPU

Chapter 3,

Central Processing Unit

Data-address generation

Chapter 6,

Addressing Modes

I/O Space

Main description

Chapter 4,

Memory

Effect of READY pin

Section 11.2 (page 11-5)

Control register locations

Table 11–3 (page 11-9)