DS2182 View Datasheet(PDF) - Dallas Semiconductor -> Maxim Integrated

Part Name

Description

Manufacturer

DS2182

T1 Line Monitor Chip

Dallas Semiconductor -> Maxim Integrated 

Figure 2. SERIAL PORT READ/WRITE

DS2182A

NOTES:

1) SDI is sampled on rising edge of SCLK.

2) SDO is updated on falling edge of SCLK.

OPERATION OF THE COUNTERS

All four of the counters in the DS2182A can be preset by the user to establish an event-count interrupt

threshold. The counters count up from the preset value until they reach saturation. At saturation, each

additional event occurrence sets the appropriate bit in RSR2 and generates an interrupt if enabled by

RIMR2.

The DS2182A contains an auto-counter reset feature in the burst read mode. If RCR1.4 is set, then the

user can burst read the four counters (five registers), and all four counters are automatically reset to 0

after the read takes place. Since the burst mode can be terminated at any time by taking CS high, the user

has the option of reading all of the registers or only the counters. If RCR1.4 is set, then any read of the

registers, burst mode or not, clears the count in all four counters. If the user wishes to read the port and

not clear the counters, then RCR1.4 must be cleared first.

The counter registers can be read or written to at any time with the serial port, which operates totally

asynchronously with the monitoring of the T1 line. Reading a register does not affect the count as long as

RCR1.4 is cleared. The dual buffer architecture of the DS2182A ensures that no error events are missed

while the serial port is being accessed for reads.

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