參數(shù)資料
型號(hào): μPD780983
廠(chǎng)商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8 位單片微控制器)
中文描述: 8位單片機(jī)微控制器(8位單片微控制器)
文件頁(yè)數(shù): 38/121頁(yè)
文件大?。?/td> 350K
代理商: ΜPD780983
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CHAPTER 3 CONTROL
38
3.6 PROGRAM DESCRIPTION
3.6.1 Initialization (Symbol name: RESTART, RAMCLR, INIT)
Initialization is performed at a reset start.
Initialization is explained below.
The control register and stack pointer are set (RESTART)
(as the stack area, 32 bytes of the saddr area, starting from 0FB00H, are secured)
Port initialization is performed (RESTART)
Excluding SFR and register bank 0, all of internal RAM is cleared (RAMCLR)
Initial setting of interrupts and the 10-bit inverter control timer (TM7) is performed (INIT)
DIP SW is input (operating mode is set) (INIT)
(1)
TM7 timer size (8/10 bits) selection
The size (8/10 bits) of TM7 is specified according to the setting of DIP SW2 bit 7 (P17).
A size of 10 bits is selected when _10BIT is set to 1.
A size of 8 bits is selected when _10BIT is set to 0.
(2)
V/f control on/off selection
Whether to turn V/f control on or off is selected according to the setting of DIP SW2 bit 6 (P16).
V/f control is turned on when _VFON is set to 1.
V/f control is turned off when _VFON is set to 0.
(3)
INTTM7 interrupt occurrence frequency selection
The frequency of INTTM7 interrupt occurrences is selected according to the input of DIP SW2 bits 0 to 2 (P10
to P12). TM7CNT will hold the value input from P10 to P12 plus 1.
(4)
TM7 count clock selection
The count clock for TM7 is selected according to the input of DIP SW2 bits 3 to 5 (P13 to P15). The TM7CLK
will hold the value input from P13 to P15.
(5)
V/f table selection
The V/f table is selected according to the input of DIP SW1 bits 0 to 2 (P20 to P22). The VFTBLNO will hold
the V/f table storage address obtained from VFTBL[] using the value input from P20 to P22 as an argument.
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