H8SSLASH2224 datasheet(161/1071 Pages) RENESAS

Il numero della parte	H8S/2224

Spiegazioni elettronici	16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series

PDF	1071 Pages

Scroll/Zoom	100%

Produttore elettronici	RENESAS [Renesas Technology Corp]

Homepage	http://www.renesas.com

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161 / 1071 page

Section 2 CPU

Rev. 5.00 Aug 08, 2006 page 75 of 982

REJ09B0054-0500

Bit

Bit Name

Initial Value

R/W

Description

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R/W

Zero Flag

Set to 1 to indicate zero data, and cleared to 0

to indicate non-zero data.

undefined

R/W

Overflow Flag

Set to 1 when an arithmetic overflow occurs,

and cleared to 0 at other times.

undefined

R/W

Carry Flag

Set to 1 when a carry occurs, and cleared to 0

otherwise. Used by:

• Add instructions, to indicate a carry

• Subtract instructions, to indicate a borrow

• Shift and rotate instructions, to indicate a

carry

The carry flag is also used as a bit accumulator

by bit manipulation instructions.

2.4.5

Initial Values of CPU Registers

Reset exception handling loads the CPU’s program counter (PC) from the vector table, clears the

trace bit in EXR to 0, and sets the interrupt mask bits in CCR and EXR to 1. The other CCR bits

and the general registers are not initialized. In particular, the stack pointer (ER7) is not initialized.

The stack pointer should therefore be initialized by an MOV.L instruction executed immediately

after a reset.

H8S/2224 Scheda tecnica(PDF) 161 Page - Renesas Technology Corp