D Question 8 Given the following values, what is the 9S12 doing? LSTRB# 0 R/W# 1

Question

D Question 8 Given the following values, what is the 9S12 doing? LSTRB# 0 R/W# 1 PORTA = 0xA8 PORTB = 0xB9 ECLK = 1 Table 1. LSTRB, ADDR[O], and R/W Decode LSTRB ADDR[O] RVw Type of Access 1 8-bit read of an even address 18-bit read of an odd address 0 8-bit write of an even address 0 8-bit write of an odd address 1 16-bit read of an even address 16-bit read of an odd address Mnemonic R8H R8L W8H W8L RLH W16 WLH (low/high data swapped) 0 16-bit write to an even address 16-bit write to an odd address (low/high data swapped)

Explanation / Answer

Answer :- Here we have Low Strobe Enable(nLSTRB) = 0, (Read / nWRITE) = 1 so it is a read operation. The ADDR[0] is same as LSB of PORTB which is 1.

Thus from table we get the operation is :- 8-bit read of an odd address.

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