H8S2245 datasheet(72/818 Pages) RENESAS

部件名	H8S2245

功能描述	Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series

PDF	818 Pages

Scroll/Zoom	100%

制造商	RENESAS [Renesas Technology Corp]

网页	http://www.renesas.com

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72 / 818 page

Section 2 CPU

Rev.3.00 Mar. 26, 2007 Page 30 of 772

REJ09B0355-0300

Free area

Stack area

SP (ER7)

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.

H8S2245 数据表(PDF) 72 Page - Renesas Technology Corp