HD6412240 RENESAS [Renesas Technology Corp], HD6412240 Datasheet - Page 72

• Manufacturer Part Number: HD6412240
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

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 read, the least significant PC bit is regarded as 0.)
(2) Extended Control Register (EXR)
This 8-bit register does not affect operation in the H8S/2245 Group.
Bit 7—Trace Bit (T): This bit is reserved. It does not affect operation in the H8S/2245 Group.
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. They do not affect operation
in the H8S/2245 Group.
Rev.3.00 Mar. 26, 2007 Page 30 of 772
REJ09B0355-0300