4501 datasheet(13/116 Pages) RENESAS

13 / 116 page

4501 Group

Rev.3.01

2005.02.07

page 13 of 112

REJ03B0104-0301

FUNCTION BLOCK OPERATIONS

CPU

(1) Arithmetic logic unit (ALU)

The arithmetic logic unit ALU performs 4-bit arithmetic such as 4-

bit data addition, comparison, AND operation, OR operation, and

bit manipulation.

(2) Register A and carry flag

change, and I/O operation.

Carry flag CY is a 1-bit flag that is set to “1” when there is a carry

with the AMC instruction (Figure 1).

It is unchanged with both A n instruction and AM instruction. The

value of A0 is stored in carry flag CY with the RAR instruction (Fig-

ure 2).

Carry flag CY can be set to “1” with the SC instruction and cleared

to “0” with the RC instruction.

(3) Registers B and E

data, and for 8-bit data transfer together with register A.

with register B used as the high-order 4 bits and register A as the

low-order 4 bits (Figure 3).

turned from the RAM back-up. Accordingly, set the initial value.

(4) Register D

It is used to store a 7-bit ROM address together with register A and

is used as a pointer within the specified page when the TABP p,

BLA p, or BMLA p instruction is executed (Figure 4).

turned from the RAM back-up. Accordingly, set the initial value.

Fig. 1 AMC instruction execution example

Fig. 2 RAR instruction execution example

Fig. 3 Registers A, B and register E

Fig. 4 TABP p instruction execution example

(CY)

(M(DP))

(A)

Addition

ALU

<Carry>

A3 A2 A1 A0

B3 B2 B1 B0

E7 E6 E5 E4 E3 E2 E1 E0

A3 A2 A1 A0

B3 B2 B1 B0

TAB instruction

TEAB instruction

TABE instruction

TBA instruction

CYA3 A2 A1 A0

CYA3 A2 A1

RAR instruction

<Set>

SC instruction

<Clear>

RC instruction

Specifying address

TABP p instruction

p6 p5 p4

p3 p2 p1 p0

PCH

DR2DR1DR0 A3 A2 A1 A0

PCL

Immediate field

value p

The contents of

ROM

840

Middle-order 4 bits

Low-order 4bits

The contents of

4501 датащи(PDF) 13 Page - Renesas Technology Corp

4501 датащи(HTML) 13 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL