The program counter (PC) is the address of the execution instruction. It can be read with an MFS instruction, but it cannot be written with an MTS instruction. When used with the MFS instruction the PC register is specified by setting Sa = 0x0000. The following figure illustrates the PC and the following table provides a description and reset value.
When 64-bit MicroBlaze is
enabled (C_DATA_SIZE = 64), the Program Counter has
up to 64 bits, according to the C_ADDR_SIZE
parameter, otherwise it has 32 bits.
Figure 1. PC
| Bits 1 | Name | Description | Reset Value |
|---|---|---|---|
|
0:31 0:C_ADDR_SIZE-1 |
PC |
Program Counter Address of executing instruction, that is, “mfs r2 0” stores the address of the mfs instruction itself in R2. |
C_BASE_VECTORS |
|
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