DP83953 datasheet(66/90 Pages) NSC

66 / 90 page

www.national.com

7.0 RIC2A Registers (Continued)

Lower Event Information Register (Lower EIR) (Page 1H Address 1FH)

Port Event Count Register (Pages 2H and 3H)

The Event Count Register (ECR) shows the instantaneous value of the specified port's 16 bit counter. The counter incre-

ments when an enabled event occurs. The counter may be cleared when it is read, and prevented from rolling over when

the maximum count is reached, by setting the appropriate control bits in the Upper Event Count mask register. Since the

RIC2A's processor port is octal and the counters are 16 bits long, a temporary holding register is employed for register

reads. When one of the counters is read, either high or low byte first, all 16 bits of the counter are transferred to a holding

accesses the holding register. This avoids the problem of events occurring in between the two processor reads and indi-

cating a false count value. In order to enter a new value to the holding register a different counter must be accessed, or

the same counter byte must be re-read.

DLU

resv

ER13

ER12

ER11

ER10

ER9

Bit

R/W

Symbol

Description

ER9

0: Flag found not generated by event on port 9

1: Flag found generated by event on port 9

ER10

0: Flag found not generated by event on port 10

1: Flag found generated by event on port 10

ER11

0: Flag found not generated by event on port 11

1: Flag found generated by event on port 11

ER12

0: Flag found not generated by event on port 12

1: Flag found generated by event on port 12

ER13

0: Flag found not generated by event on port 13

1: Flag found generated by event on port 13

resv

Reserved for Future Use

reads as a logic 0

resv

Reserved for Future Use

reads as a logic 0

R/W

DLU

Disable the LED Updates: This bit disables the LED display updates for a

faster processor register access

0: Re-enable the LED update cycle.(Note)

1: Disable the LED update cycles

Note: The LED update cycle will be re-enabled only when the network and the RIC2A internal state ma-

chines are idle

Lower Byte

EC7

EC6

EC5

EC4

EC3

EC2

EC1

EC0

Upper Byte

EC15

EC14

EC13

EC12

EC11

EC10

EC9

EC8

DP83953 Datasheet(PDF) 66 Page - National Semiconductor (TI)

DP83953 Datasheet(HTML) 66 Page - National Semiconductor (TI)

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90

Datasheet Download

Link URL