z02205 ZiLOG Semiconductor, z02205 Datasheet - Page 21

• Manufacturer Part Number: z02205
• Description: Modem Controller Ideal For Low Power Consumption, Small Size Requirements
• Manufacturer: ZiLOG Semiconductor

ZiLOG
PS001000-MOD0599
Register
S21
S22
S23
S24
S25
S26
S27
S28
S29
S37
Range
Reserved
Reserved
Reserved
Reserved
0–255
Reserved
Reserved
0–255
0–255
0–6
Units
Reserved
Reserved
Reserved
Reserved
seconds
or 1/100 sec.
Reserved
Reserved
minutes
1/50th sec
code
Description
Reserved
Reserved
Reserved
Reserved
During synchronous operation with the &Q1 command in effect, S-register S25 indicates
the number of seconds after a telephone line connection is made before the modem
examines DTR. This register allows sufficient time to disconnect the modem from an
asynchronous terminal and attach it to a synchronous terminal. In the On-Line or
Command state during any mode of operation, changes in DTR for less than S25
hundredths of a second are ignored.
Reserved
Reserved
Terminal inactivity timeout. Hangs up the modem after S28 minutes if no characters are
received from the modem’s terminal. Default = 0
Hook Flash On-Hook time. The amount of time in 20 millisecond units the modem will
leave the telephone on-hook while performing a hook-flash according to the “!” dial
string modifier. Default = 25 fiftieths of a second.
Sets the Highest Line Rate. This register determines the highest telephone line data rate
the modem will use when connecting with a remote modem. See “Setting the Highest
Line Rate” section on the following page. Default = 0.
Table 4. Modem S-Registers (Continued)
Modem Controller
Z02205
19