I am using a RX63n series -10 bit ADC. I am using a continuous scan mode for 10 bit adc. On channel AN0 to AN4 is 24 v monitor. AN5 , AN6 is a stepper motor monitor. AN7 is 5V monitor. Channel AN0-4 works fine. Channel AN7 reading very less voltage as less than 1 v. On pin the voltage comes fine 5v but adc register shows less count value after conversion. I am using following setting -
AD.ADCSR.BYTE = 0x47u; // 01000111
// |||||||+- CH[0] When ADCR.MODE[1:0] == 10b or 11b, this selects the scan channel
// ||||||+-- CH[1] b'111' scans channels AN0 to AN7
// |||||+--- CH[2]
// ||||+---- RESERVED
// |||+----- RESERVED
// ||+------ ADST 0:Stops A/D conversion. 1:Starts A/D conversion
// |+------- ADIE 0:ADIO interrupt is disabled by completing A/D conversion. 1:ADIO interrupt is enabled by completing A/D conversion.
// +-------- RESERVED
AD.ADCR.BYTE = 0x0Eu; // 00001110
// |||||||+- MODE[0] 00:Single channel mode. 01:Setting prohibited. 10:Continuous scan move. 11:Single scan mode.
// ||||||+-- MODE[1]
// |||||+--- CKS[0] 00:PCLK/8. 01:PCLK/4. 10:PCLK/2. 11:PCLK
// ||||+---- CKS[1]
// |||+----- RESERVED
// ||+------ TRGS[0] 000:SW trigger.
// |+------- TRGS[1]
// +-------- TRGS[2]
AD.ADCR2.BYTE = 0x00u; // 00000000
// |||||||+- RESERVED
// ||||||+-- RESERVED
// |||||+--- RESERVED
// ||||+---- RESERVED
// |||+----- EXSEL[0] 00:Analog input channel (ANxx). 01:ANEX1. 10,11:Settings prohibited.
// ||+------ EXSEL[1]
// |+------- EXOEN Extended Analog Output Control. 0:Output is disabled. 1:Output is enabled.
// +-------- DPSEL 0:A/D data is flush-right. 1:A/D data is flush-left.
AD.ADSSTR = 0xFFu; // 11111111
Please help.