Chapter 2
CPU
II - 4 Overview
2.1.4 Stack Pointer (SP)
This register shows the top address of the stack. The initial value of SP is "0x0100".
Figure:2.1.3 Stack Pointer
2.1.5 Program Counter (PC)
This register gives the address of the currently executed instruction, and the LSB shows the half-byte(4-bit) infor-
mation. The value of vector table at the address of "0x04000" is stored in PC just after the LSI reset.
Figure:2.1.4 Program Counter
SP
15 0
Stack Pointer
PC
19 H
Program Counter
0
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