h8s-2169 Renesas Electronics Corporation., h8s-2169 Datasheet - Page 72

• Manufacturer Part Number: h8s-2169
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 2 CPU
Free area
SP (ER7)
Stack area
Figure 2.9 Stack
2.4.3
Control Registers
The control registers are the 24-bit program counter (PC), 8-bit extended control register (EXR),
and 8-bit condition-code register (CCR).
(1) 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, the least significant PC bit is regarded as 0.)
(2) Extended Control Register (EXR)
An 8-bit register. In the H8S/2169 or H8S/2149, this register does not affect operation.
Bit 7—Trace Bit (T): This bit is reserved. In the H8S/2169 or H8S/2149, this bit does not affect
operation.
Bits 6 to 3—Reserved: These bits are reserved. They are always read as 1.
Bits 2 to 0—Interrupt Mask Bits (I2 to I0): These bits are reserved. In the H8S/2169 or
H8S/2149, these bits do not affect operation.
Rev. 3.00 Jan 18, 2006 page 44 of 1044
REJ09B0280-0300