DP83256VF datasheet(70/144 Pages) NSC

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50 Registers (Continued)

526 CURRENT INJECTION COUNT REGISTER (CIJCR)

The Current Injection Count Register takes a snap-shot of the Injection Counter during every Control Bus Interface read cycle of

this register

During a Control Bus Interface write cycle the Control Bus Write Command Reject bit (CCR) of the Interrupt Condition Register

(ICR) will be set to 1 and will ignore a write cycle

The Injection Counter is an 8-bit down-counter which decrements every 80 ns

The counter is active only during One Shot or Periodic Injection Modes (ie Injection Controlk10l bits (ICk10l)ofthe

Current Transmit State Register (CTSR) are set to either 01 or 10)

The Injection Threshold Register (IJTR) value is loaded into the Injection Counter when the counter reaches zero and during

every Control Bus Interface write cycle of IJTR

The counter is initialized to 0 during the reset process (ie ERSTeGND)

ACCESS RULES

ADDRESS

READ

WRITE

19h

Always

Write Reject

IJC7

IJC6

IJC5

IJC4

IJC3

IJC2

IJC1

IJC0

Bit

Symbol

Description

D0 – D7

IJC0 – IJC7

INJECTION COUNT BITk0-7l

Current value of the Injection Counter

IJC0 is the Least Significant Bit (LSB)

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