INTEL 186 EB/EC EVALUATION BOARD USER’S MANUAL
{STEP SSTEP} FROM code_addr count
This command loads the user’s program counter (PC) with code_addr and then single-steps count times.
5.4DISPLAYING AND MODIFYING PROGRAM VARIABLES
iECM-86 provides commands to display and modify program variables in several formats. In addition to simple variables such as bytes and words, more complicated variables such as reals and character strings are supported. iECM-86 commands allow variables to be displayed or initialized either individually or as regions of memory that contain variables of the given type.
5.4.1Supported Data Types
| Table 5-1. Supported Data Types |
| |
Data Type | Description |
| |
BYTE | A BYTE is an eight-bit variable. No alignment rules are enforced for BYTE |
| variables. |
| |
CHAR | A CHAR is a special case of a BYTE. CHAR variables are displayed as |
| ASCII characters. |
| |
WORD | A WORD is a 16-bit variable. The address of a WORD is the address of its |
| least significant byte. |
| |
DWORD | A DWORD is a 32-bit variable. The address of a DWORD is the address of |
| its least significant byte. |
| |
STACK | A STACK variable is a 16-bit variable that resides in the system stack. The |
| address of a stack variable (stack_addr) is taken to be relative to the current |
| stack pointer |
| |
STRING | A STRING is a sequence of ASCII characters that are terminated by the |
| NUL character. The ASCII character NUL has the binary value of zero. |
| |
PORT | A PORT is an 8-bit I/O port. No alignment rules are enforced for PORTs. |
| |
WPORT | A WPORT is a 16-bit I/O port. The address of a WPORT is the address of its |
| least significant byte. A WPORT must start at an even address. |
| |
In addition to supporting access to variables of the above types, iECM-86 also provides commands to access the microprocessor registers and other special program variables such as PC (program counter), and SP (stack pointer). These commands include AX, AH, AL, BX, BH, BL, CX, CH, and CL.
5-10
