Program Counter (Pc); Extended Control Register (Exr); Figure 2.8 Stack - Renesas H8S/2158 User Manual

2.4.2

Program Counter (PC)

This 24-bit counter indicates the address of the next instruction the CPU will execute. The length
of all CPU instructions is 2 bytes (one word), so the least significant PC bit is ignored. (When an
instruction is fetched for read, the least significant PC bit is regarded as 0.)
2.4.3

Extended Control Register (EXR)

EXR does not affect operation in this LSI.
Bit Bit Name
7 T
6 to 3 —
2 I2
1 I1
0 I0
SP (ER7)

Figure 2.8 Stack

Initial Value R/W
0 R/W
All 1 R
1 R/W
1
1
Description
Trace Bit
Does not affect operation in this LSI.
Reserved
These bits are always read as 1.
Interrupt Mask Bits 2 to 0
Do not affect operation in this LSI.
Rev. 3.00 Jan 25, 2006 page 27 of 872
Section 2 CPU
Free area
Stack area
REJ09B0286-0300