HD6433723 datasheet(39/352 Pages) RENESAS

Part #	HD6433723

Description	Renesas 8-Bit Single-Chip Microcomputer H8 Family/H8/300L Series

PDF	352 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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39 / 352 page

Rev. 3.00, 12/94, page 24 of 334

2.2.3 Initial Register Values

When the CPU is reset, the program counter (PC) is loaded from the vector table and the I bit in

the CCR is set to 1. The other CCR bits and the general registers are not initialized. In particular,

the stack pointer (R7) is not initialized. To prevent program crashes the stack pointer should be

initialized by software, by the first instruction executed after a reset.

2.3 Data Formats

The H8/300L CPU can process 1-bit data, 4-bit (BCD) data, 8-bit (byte) data, and 16-bit (word)

data.

•

Bit manipulation instructions operate on 1-bit data specified as bit n in a byte operand

(n = 0, 1, 2, ..., 7).

•

All arithmetic instructions except ADDS and SUBS can operate on byte data.

•

The MOV.W, ADD.W, SUB.W, CMP.W, ADDS, SUBS, MULXU (8 bits

× 8 bits), and

DIVXU (16 bits ÷ 8 bits) instructions operate on word data.

•

The DAA and DAS instructions perform decimal arithmetic adjustments on byte data in

packed BCD form. Each nibble of the byte is treated as a decimal digit.

HD6433723 Datasheet(PDF) 39 Page - Renesas Technology Corp