MC908SR12MFAE Freescale Semiconductor, MC908SR12MFAE Datasheet - Page 316

• Manufacturer Part Number: MC908SR12MFAE
• Description: IC MCU 12K FLASH 8MHZ 48-LQFP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC908SR12MFAE

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: I²C, SCI
• Peripherals: LVD, POR, PWM, Temp Sensor
• Number Of I /o: 31
• Program Memory Size: 12KB (12K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 14x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Multi-Master IIC Interface (MMIIC)
17.10 SMBus Protocol Implementation
Data Sheet
316
MASTER MODE
START
SLAVE MODE
START
OPERATION:
Prepare for Master mode
ACTION:
1. Load slave address to MMADR
2. Clear MMRW
3. Load command to MMDTR
4. Set MMAST
OPERATION:
Prepare for Slave mode
ACTION:
1. Load slave address to MMADR
2. Clear MMTXAK
3. Clear MMAST
Shaded data packets indicate transmissions by the MCU
Address
Address
OPERATION:
Slave address match and
FLAGS:
MMRXIF set
MMATCH set
MMSRW depends on 8th
ACTION:
1. Check MMSRW
2. Read Slave address
check for data direction
bit of calling address byte
OPERATION:
Prepare for repeated START
FLAGS:
MMTXIF set
MMRXAK clear
ACTION:
1. Set MMRW
2. Set REPSEN
3. Clear MMTXAK
4. Load dummy ($FF) to MMDTR
0
0
ACK
ACK
Command
Command
Figure 17-20. SMBus Protocol Implementation
OPERATION:
Read and decode received command
FLAGS:
MMRXIF set
MMATCH clear
ACTION:
Load Data1 to MMDTR
ACK
ACK
OPERATION:
Slave address match and
FLAGS:
MMRXIF set
MMATCH set
MMSRW depends on 8th
ACTION:
Check MMSRW
get ready to transmit data
bit of calling address byte
START
START
Multi-Master IIC Interface (MMIIC)
OPERATION:
Get ready to receive data
FLAGS:
MMTXIF set
MMRXAK clear
ACTION:
Load dummy ($FF) to MMDTR
Address
Address
1
1
ACK
ACK
OPERATION:
Transmit data
FLAGS:
MMTXIF set
ACTION:
Load Data2 to MMDTR
RX Data1
TX Data1
OPERATION:
Read received data
FLAGS:
MMRXIF set
ACTION:
Read Data1 from MMDRR
MC68HC908SR12•MC68HC08SR12 — Rev. 5.0
OPERATION:
Transmit data
FLAGS:
MMTXIF set
MMRXAK clear
ACTION:
Load Data3 to MMDTR
OPERATION:
Read received data and prepare for STOP
FLAGS:
MMRXIF set
ACTION:
1. Set MMTXAK
2. Read Data(N-1) from MMDRR
3. Clear MMAST
ACK
ACK
OPERATION:
Last data is going to be sent
FLAGS:
MMTXIF set
MMRXAK clear
ACTION:
Load dummy ($FF) to MMDTR
ACK
ACK
Freescale Semiconductor
OPERATION:
Last data sent
FLAGS:
MMTXIF set
MMRXAK set
ACTION:
Load dummy ($FF) to MMDTR
RX DataN
TX DataN
OPERATION:
Generate STOP
FLAGS:
MMRXIF set
ACTION:
Read DataN from MMDRR
NAK
NAK
STOP
STOP