EM78P458/459
OTP ROM
(1)Write to the three bits (IMS2:IMS0) on the
(2)Write to the ADCON register to configure AD module:
(a)Select A/D input channel ( ADAS2:ADAS0 );
(b)Select the proper gains by writing to the GCON register ( optional );
(c)Define A/D conversion clock rate ( CKR1:CKR0 );
(d)Set the ADPD bit to 1 to begin sampling.
(3)Put “ENI” instruction, if the interrupt function is employed.
(4)Set the ADRUN bit to 1.
(5)Wait for either the interrupt flag to be set or the ADC interrupt to occur.
(6)Read ADDATA, the conversion data register.
(7)Clear the interrupt flag bit (ADIF).
(8)For next conversion, go to Step 1 or Step 2 as required. At least 2 Tct is required before next acquisition starts.
<Note>: To obtain an accurate value, it is necessary to avoid any data transition on I/O pins during AD conversion.
2.The Demonstration Programs
;To define the general registers
R_0 == 0 | ; Indirect addressing register |
PSW == 3 | ; Status register |
PORT5 == 5 |
|
PORT6 == 6 |
|
R_F== 0XF | ; Interrupt status register |
; To define the control register |
|
IOC50 == 0X5 | ; Control Register of Port 5 |
IOC60 == 0X6 | ; Control Register of Port 6 |
C_INT== 0XF | ; Interrupt Control Register |
This specification is subject to change without prior notice. | 35 | 07.01.2003 (V1.3) |