AN205179 F²MC-8FX Family MB95410H/470H Series 8-Bit Microcontroller One Phase Power Meter (CS5464) Solution Real Time Clock and Data Storage Operation Associated Part Family: MB95410H/470H Series This application note describes how to use One Phase Power Meter (CS5464) solution’s real time clock and data storage function. 1 Introduction This application note describes how to use One Phase Power Meter (CS5464) solution’s real time clock and data storage function. Section 2 explains the Background. Section 3 explains the HW Diagram. Section 4 explains the HW Reference SCH. Section 5 explains the FW diagram. Section 6 explains the FW Function List. 2 Background Background of Real time Clock and Data Storage Function 2.1 Overview In the power meter solution, real time clock unit is RX8025T, and data storage unit is AT24C64. The communication 2 method between MCU and these two units is I C communication. 3 HW Diagram Hardware diagram of real time clock unit and data storage unit 3.1 HW Diagram of Real Time Clock Unit and Data Storage Unit Figure 1. Hardware diagram RX8025T MB95F418 MB85RC64 www.cypress.com Document No. 002-05179 Rev. *A 1 One Phase Power Meter (CS5464) Solution Real Time Clock and Data Storage Operation 4 HW Reference SCH Hardware reference SCH of real time clock unit and data storage unit Figure 2. Real time Clock Unit VCC I2C_SCL VCC C30 C31 106 104 1 2 3 4 5 6 7 R56 2K U13 14 13 12 11 10 9 8 T1(CE) NC4 SCL SDA FOUT T2(VPP) NC1 GND TEST /INT VDD NC3 FOE NC2 R54 I2C_SDA 10K GND RTC_nINTA RX8025T Figure 3. Data Storage Unit A0 VCC A1 WP A2 SCL GND SDA 8 7 6 5 MB85RC64 www.cypress.com C28 R49 R47 104 10K 10K 2 R65 R55 10K 10K 3 I2C_SCL Q13 BSS138/SOT23 1 1 2 3 4 U12 VCC 1 3.3V 2 3 Q12 BSS138/SOT23 Document No. 002-05179 Rev.*A I2C_SDA 2 One Phase Power Meter (CS5464) Solution Real Time Clock and Data Storage Operation 5 FW diagram Firmware system diagram 5.1 Real time Clock Unit Communication Protocol For RTC function’s communication protocol, refer to the IIC bus protocol which is shown in Figure 4. Description is as below: 1. Master sends a start condition and a byte data including 7 bits slave address and 1 bit R/W.RTC’s salve address is 0110010. 2. Master waits ACK from slave. 3. Master sends a byte RTC register address (0~F), which is shown in Figure 5. 4. Master waits ACK from slave. 5. Master sends n bytes data to slave. And at the end of each byte master needs to wait slave’s ACK. 6. Master sends a stop condition to slave. Figure 4. RTC Communication Protocol www.cypress.com Document No. 002-05179 Rev.*A 3 One Phase Power Meter (CS5464) Solution Real Time Clock and Data Storage Operation Figure 5. RTC’s register Description www.cypress.com Document No. 002-05179 Rev.*A 4 One Phase Power Meter (CS5464) Solution Real Time Clock and Data Storage Operation 5.2 Data Storage Unit Communication Protocol For EEPROM function’s communication protocol, refer to the IIC bus protocol which is shown in Figure 4. Description is as below: 5.3 1. Master sends a start condition and a byte data including 7 bits slave address and 1 bit R/W.EEPROM’s salve address is 1010000. 2. Master waits ACK from slave. 3. Master sends 2 bytes EEPROM data address (0x0000~0xFFFF).First sends the address high byte. Then sends the address low byte. And in the end of each byte master needs to wait slave’s ACK. 4. Master sends n bytes data to slave. And in the end of each byte master need to wait slave’s ACK. 5. Master sends a stop condition to salve. Firmware System Diagram Figure 6: Firmware System Diagram Start Init IIC module Init RX8025T registers Enable 1s interrupt 1s interrupt？ N Y Update the clock www.cypress.com Document No. 002-05179 Rev.*A 5 One Phase Power Meter (CS5464) Solution Real Time Clock and Data Storage Operation 6 FW Function List 6.1 API Table 1. FW API List Function Prototype 6.2 Description void RTC_Config(void) Config working mode for RTC RX8025T void RTC_IntDisable(void) Disable interrupt output for RTC void RTC_Read(void) Read RTC RX8025T calendar data void RTC_Write(void) Set RTC RX8025T calendar data void EEPROM_Write(INT8U *eeBuff) Write a series of data byte to EEPROM void EEPROM_Read(INT8U *eeBuff) Read a series of data byte from EEPROM INT8U EEPROM_Write_Verify(INT8U *eeBuff) Write a series of data byte to EEPROM and verify the result INT8U EEPROM_Read_Verify(INT8U *eeBuff) Read a series of data byte from EEPROM and validate checksum HAL Table 2. FW HAL List Function Prototype Description void IIC_Init(void) Init IIC bus INT8U IIC_Acknowledge(void) waitting ACK from slave INT8U IIC_Start(INT8U slave_address) Master generates a START condition on IIC bus and transmit slave_address INT8U IIC_Restart(INT8U slave_address) Master generates a RESTART condition on IIC bus INT8U IIC_Stop(void) Master generates a STOP condition on IIC bus INT8U IIC_SendByte(INT8U outDat) Master send out a byte of data and return with ACK/NACK INT8U IIC_Write(INT8U *buff, INT8U total) Master write a string of bytes through IIC us INT8U IIC_ReadByte(void) Master read a byte of data and set ACK/NACK INT8U IIC_Read(INT8U *buff, INT16U total) Master read a string of data bytes through IIC us www.cypress.com Document No. 002-05179 Rev.*A 6 One Phase Power Meter (CS5464) Solution Real Time Clock and Data Storage Operation 7 Additional Information For more information on Cypress products, please visit the following website: http://www.cypress.com/cypress-microcontrollers www.cypress.com Document No. 002-05179 Rev.*A 7 One Phase Power Meter (CS5464) Solution Real Time Clock and Data Storage Operation Document History Document Title: AN205179 – F²MC-8FX Family MB95410H/470H Series 8-Bit Microcontroller One Phase Power Meter (CS5464) Solution Real Time Clock and Data Storage Operation Document Number: 002-05179 Revision ECN Orig. of Change Submission Date ** - HUAL 06/18/2011 Initial release *A 5277409 HUAL 05/20/2016 Migrated Spansion Application Note MCU-AN-500119-E-10 to Cypress format. www.cypress.com Description of Change Document No. 002-05179 Rev.*A 8 One Phase Power Meter (CS5464) Solution Real Time Clock and Data Storage Operation Worldwide Sales and Design Support Cypress maintains a worldwide network of offices, solution centers, manufacturer’s representatives, and distributors. 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