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Chapter 2 Specification of Communication port for CPU module

2 – 11

Details of the status register, the control register, the transmitting counter, and the receiving counter are described

below.

Status registe

Control registe

Transmitting counte

Receiving counte

+00

+01

+02

+03

b0 b7b8

b15

[1] [2] [3] [4]

[A] [B]

[5]

Figure 2.8 Status register, Control register, Transmitting counter, and Receiving counter

[ Status register ]

[1] ASR port status flag 1: Under open, 0: Under close

[2] Event transmitting completion flag 1: Transmitting completion

[3] Receiving completion flag 1: Receiving completion

[4] Error flag 1: Error occurrence

[5] Error code 0x01: Event transmitting request flag [B] is turned ON while ASR

port status flag [A] is closed.

0x02: Event transmitting request flag is turned ON again in status

which the transmitting of message is not completed.

[ Control register ]

[A] ASR port open request flag 1: Open request, 0: Close request

[B] Event transmitting request flag 1: Transmitting start

[ Transmitting counter ]

Stores the number of transmitting of message data.

[ Receiving counter ]

Stores the number of receiving of message data.

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RTS WM300 Spécifications Page 25