MCS11 datasheet(51/108 Pages) PADAUK

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MCS11

ADC-Type Enhanced FPPA

TM Controller

Page 51 of 108

PDK-DS-MCS11_v020 – Apr. 20, 2018

5-16-4. AD conversion

The process of AD conversion starts from setting START/DONE bit (bit 6 of adcc) to high, the

START/DONE flag for read will be cleared automatically, then converting analog signal bit by bit and finally

setting START/DONE high to indicate the completion of AD conversion. If ADCLK is selected, TADCLK is the

period of ADCLK and the AD conversion time can be calculated as follows:

 8-bit resolution: AD conversion time = 13 T

ADCLK

 9-bit resolution: AD conversion time = 14 T

ADCLK

 10-bit resolution: AD conversion time = 15 T

ADCLK

5-16-5. Configure the analog pins

The 10 external analog input signals for ADC shared with PA3, PA4 and PB[7:0]. In order to avoid leakage

current at the digital circuit portion, those pins which are defined for analog inputs should disable the digital

input function (set the corresponding bit of padidr or pbdidr register to be 1). Because the measurement

signals of ADC belong to small signal; it should avoid the measured signal to be interfered during the

measurement period, the selected pin should (1) be set to input mode (2) turn off weak pull-high resistor (3)

set the corresponding pin to analog input by port A/B digital input disable register (padidr / pbdidr).

The following steps are recommended to do the AD conversion procedure:

(1)

Configure the ADC module:

 Select the ADC input channel by adcc register

 Select the bit resolution of ADC by adcm register

 Configure the AD conversion clock by adcm register

 Configure the pin as analog input by padidr, pbdidr register

 Enable the ADC module by adcc register

(2)

Configure interrupt for ADC: (if desired)

 Clear the ADC interrupt request flag in bit 3 of intrq register

 Enable the ADC interrupt request in bit 3 of inten register

 Enable global interrupt by issuing engint command

(3)

Start AD conversion:

 Set ADC process control bit in the adcc register to start the conversion (set1 adcc.6).

(4)

Wait for the completion flag of AD conversion, by either:

 Waiting for the completion flag by using command “wait1 addc.6”; or

 Waiting for the ADC interrupt.

(5)

Read the ADC result registers:

 Read adcrh and adcrl the result registers

(6)

For next conversion, goto step 1 or step 2 as required.

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