Intel 80C188EB Writewport Code 19H, Step Code 1AH, Readreg Code 1BH, Writereg Code 1CH, Flags

INTEL 186 EB/EC EVALUATION BOARD USER’S MANUAL

6.5.20 WRITE_WPORT (Code 19H)

This command stores the least-significant word of the RISM_DATA register in the 16-bit output port pointed to by the RISM_ADDR register.

6.5.21 STEP (Code 1AH)

This command sets the target processor’s TRAP_FLAG and the RUN_FLAG and steps one instruction. After setting these flags, the action of this command is similar to the START_USER command followed by a TRAP.

6.5.22 READ_REG (Code 1BH)

This command reads the word value of a CPU register pointed to by the most-significant word of the RISM_DATA register and places the result in the least-significant word of the RISM_DATA register. Registers are accessed as shown in Table 6-2:

Table 6-2. iRISM Registers

MSW of RISM_DATA	Register
0000H	SS
0001H	ES
0002H	DS
0003H	DI
0004H	SI
0005H	BP
0006H	SP
0007H	BX
0008H	DX
0009H	CX
000AH	AX
000BH	IP
000CH	CS
000DH	FLAGS

6.5.23 WRITE_REG (Code 1CH)

This command stores the least-significant word of the RISM_DATA register in the CPU register pointed to by the most-significant word of the RISM_DATA register. Registers are accessed as shown in Table 6-2.

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