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TMP47C201M Datenblatt(PDF) 10 Page - Toshiba Semiconductor

Teilenummer TMP47C201M
Bauteilbeschribung  CMOS 4-bit Microcontroller
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Hersteller  TOSHIBA [Toshiba Semiconductor]
Direct Link  http://www.semicon.toshiba.co.jp/eng
Logo TOSHIBA - Toshiba Semiconductor

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TOSHIBA CORPORATION
TMP47C101/201
(5)
Zero-page
The 16 words (at addresses 00H through 0FH) of the
zero page of the data memory can be used as the user
flags or pointers by using zero-page addressing mode
instructions (comparison, addition, transfer, and bit
manipulation), providing enhanced efficiency in pro-
gramming.
Example: To write immediate data “8” to address 09H if
bit 2 at address 04H in the RAM is “1”.
TEST 04H,2
;
Skips if bit 2 at address 04H in
the RAM is “0”.
B
SKIP
ST
#8, 09H ;
Writes “8” to address 09H in the
RAM
SKIP:
2.4.2 Data Memory Capacity
Figure 2-10. Data Memory Capacity and Address Assignment
When power-on is performed, the contents of the RAM
become unpredictable, so that they must be initialized by the
initialization routine.
Example: To clear RAM (use common to the 47C101 and
47C201)
LD
HL, #00H
; HL
←00H
SCLRRAM:
ST
#0, @HL+
; RAM [HL]
←0, LR
LR + 1
B
SCLRRAM
ADD H, #1
; HR
←HR + 1
B
SCLRRAM
2.5 ALU and Accumulator
2.5.1 Arithmetic/Logic Unit (ALU)
The ALU performs the arithmetic and logic operations speci-
fied by instructions on 4-bit binary data and outputs the result
of the operation, the carry information(C), and the zero detect
information (z).
(1)
Carry information (C)
The carry information indicates a carry-out from the
most significant bit in an addition. A subtraction is per-
formed as addition of two’s complement, so that, with
a subtraction, the carry information indicates that there
is no borrow to the most significant bit. With a rotate
instruction, the information indicates the data to be
shifted out from the accumulator.


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