Zilog Z02215 User Manual

UP002402-1001

INTRODUCTION

Z02215

SINGLE-CHIP MODEM ERRATA

This Product Update provides errata information for the Z02215 Single-Chip Modem.

• Problem #1 - Autobaud Detection

• Problem #2 - Par allel Phone Off-Hook and Par al-

lel Phone Pick-Up Detection

• Problem #3 - Ring Indicator (RI)

• Problem #4 - Parallel Phone Pick-Up Detec tion

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The following table lists the firmware versions iden­tified in t h is e r r ata.

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Note: Initial tes t vector coverage did not include
UART testing. The testing has been fixed and die
after date code 0136 SL UART has been fully tested.

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4508
50A5

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Problem #1 - Autobaud Detection

Versions: Z02215 ROM Code 4508
Updated: July 17, 2000

Problem: Some character sequences other than AT

can cause the automatic detection of speed and parity
of characters from the terminal to fail, preventing
modem command input from the terminal. This is
expected to be a very rare occurr ence in embedded
environments where the comm unication between the
Z02215 and its host processor are carefully con­trolled.

Problem #2 - Parallel Phone Off-Hook
and Parallel Phone Pick-Up Detection

Versions: Z02215 ROM Code 4508
Updated: July 17, 2000
Problem: Off-hook and Pick-up detection do not

work properly.
Solution: None

Problem #3 - R ing Indicator (RI)

Versions: Z02215 ROM Code 50A5
Updated: July 17, 2000

Problem: After reset, the Z02215 RI

(active). This is incorrect. This may cause a host pro­cessor monitoring the R I
signal.

Solution: The state of the RI
the Z02215 when the telephone is placed on-hook
after a data connection, or after the first RING is
received from the telephone line. To detect a RING
using the RI
detect the e nd of the RING when RI
active to inactive ).

signal, detect the rising edge (that is,

to not detect the first RING

signal is corrected by

is set to 0V

switches from

Problem #4 - Parallel Phone Pick-Up
Detection

Versions: Z02215 ROM Code 50A5
Updated: July 17, 2000
Problem: When pick-up detection is enabled, the

Z02215 will detect itself taking the telephone off­hook to dial or answer a call as a parallel extension
being taken off-hook. This results in the Z02215
immediately placing the telephone line back on­hook.

Solution: If the Z02215 fails to respond to a modem AT command, reset the Z02215.

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Solution: A software solution f or outgoing calls is to dial:

ATH1, DT1234567
“H1” takes the telephone off-hook, “,” causes the Z02215 to wait the time in S-Register S8 (default 2 sec-

onds), and “DT1234567” causes the Z02215 to tone dial the number 1234567. Use S-Register S8 to
increase or decrease the delay before dialing.

Similarly, to answer the telephone, use
ATH1,A
Alternatively, design a pick-up detection circuit that does not respond for a sufficient period of time after

the Z02215 has taken the telephone off-hook.

Problem #5 - Unformatted Caller ID

Versions: Z02215 ROM Codes 4508 & 50A5
Updated: October 03, 2001

Problem: When unformatted caller ID option is used (AT#CID=0), the final octet of the caller ID packet

(the checksum octet) is not sent to the host.
Solution: No solution is possible. All data octets are passed onto the host as received but without the

checksum octet it is not possible to ensure the accuracy of the data packet. Use the formatted opt ion if pos­sible.

Information Integrity

The information contained within this document has been verified according to the general principles of
electrical and mechanical engineering. Any applicable source code illustrated in the document was either
written by an authorized ZiLOG employee or licensed consultant. Permission to use these codes in any
form, besides the intended application, must be approved through a license agreement between both
parties. ZiLOG will not be responsible fo r any code(s ) used beyond the intended appl ic ation. Contact the
local ZiLOG Sales Office to obtain necessary license agreements.

Document Disclaimer

©2001 by ZiLOG, Inc. All rights reserved. Information in this publication concerning the devices, applications, or
technology described is intended to suggest possibl e uses and may be superseded. ZiLOG, INC. DOES NOT
ASSUME LIABILITY FOR OR PROVIDE A REPRESENTATION OF ACCURACY OF THE INFORMATION, DEVICES,
OR TECHNOLOGY DESCRIBED IN THIS DOCUMENT. ZiL OG ALSO DOES NOT ASSUME LIABILITY FOR
INTELLECTUAL PROPERTY INFRINGEMENT RELATED IN ANY MANNER TO USE OF INFORMATION, DEVICES,
OR TECHNOLOGY DESCRIBED HEREIN OR OTHERWISE. Devices sold by ZiLOG, Inc. are covered by warranty
and limitation of liability provisions appearing in the ZiLOG, Inc. Term s and Conditions of Sale. ZiLOG, Inc. makes no
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conveyed, impli citly or otherwise, by this document und er any intellectual property rights.

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Telephone: [phone] • Fax: [phone] • Internet: www.zilog.com