參數(shù)資料
型號(hào)： UPD17149GTA1
廠商： NEC Corp.
英文描述： SMALL, GENERAL-PURPOSE 4-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述： 小，通用4位單晶片微控制器
文件頁(yè)數(shù)： 72/102頁(yè)
文件大小： 408K
代理商： UPD17149GTA1
72
μ
PD17145(A1), 17147(A1), 17149(A1)
21. ASSEMBLER RESERVED WORDS
21.1 Mask Option Directive
The
μ
PD17149 (A1) has the following mask options:
Internal pull-up resistor of RESET pin
Internal pull-up resistor of P0F
1
and P0F
0
pins
Internal pull-up resistor of INT pin
Internal POC circuit
When developing a program, it is necessary to specify all the above mask options in the source program by
using a mask option definition directive (pseudo instruction).
21.1.1 Specifying mask option
The mask option is described in the assembler source program by using the following directives:
OPTION directive, ENDOP directive
Mask option definition directive
(1) OPTION and ENDOP directives
These directives specify the range in which the mask option is specified (mask option definition block).
Specify the mask option by describing a mask option definition directive in the area sandwiched between
the OPTION and ENDOP directives.
Format
Symbol field
[label:]
Mnemonic field
OPTION
Operand field
Comment field
[;comment]
ENDOP
…
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