MM912H634DM1AER2 Freescale Semiconductor, MM912H634DM1AER2 Datasheet - Page 284

• Manufacturer Part Number: MM912H634DM1AER2
• Description: 16-bit Microcontrollers - MCU 64KS12 LIN2XLS/HS ISENSE
• Manufacturer: Freescale Semiconductor

Specifications of MM912H634DM1AER2

• Rohs: yes
• Core: HCS12
• Processor Series: MM912F634
• Data Bus Width: 16 bit
• Maximum Clock Frequency: 20 MHz
• Program Memory Size: 32 KB
• Data Ram Size: 2 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 5.5 V to 18 V
• Operating Temperature Range: - 40 C to + 105 C
• Package / Case: LQFP-48
• Mounting Style: SMD/SMT
• A/d Bit Size: 10 bit
• A/d Channels Available: 15
• Interface Type: SPI
• Maximum Operating Temperature: + 105 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 15
• Number Of Timers: 1
• Program Memory Type: Flash
• Supply Voltage - Max: 18 V
• Supply Voltage - Min: 5.5 V

Functional Description and Application Information
If the FCLKDIV register is written, the FDIVLD bit is set automatically. If the FDIVLD bit is 0, the FCLKDIV register has not been
written since the last reset. If the FCLKDIV register has not been written to, the Flash command loaded during a command write
sequence will not execute and the ACCERR flag in the FSTAT register will set.
Freescale Semiconductor
Program and erase command execution time will increase proportionally with the period of
FCLK. Programming or erasing the Flash memory with FCLK < 150 kHz should be avoided.
Setting FCLKDIV to a value such that FCLK < 150 kHz can destroy the Flash memory due
to overstress. Setting FCLKDIV to a value such that FCLK > 200 kHz can result in
incomplete programming or erasure of the Flash memory cells.
set FDIV[5:0] = PRDCLK[kHz]/200-1
Figure 85. Determination Procedure for PRDIV8 and FDIV Bits
FCLK = (PRDCLK)/(1+FDIV[5:0])
PRDCLK = bus_clock/8
PRDIV8 = 0 (reset)
PRDCLK[kHz]/200
set PRDIV8=1
bus_clock
bus_clock
an integer?
START
12.8 MHz?
0.3 MHz?
END
no
yes
yes
CAUTION
yes
no
no
PRDCLK = bus_clock
set FDIV[5:0] = INT(PRDCLK[kHz]/200)
ALL PROGRAM AND ERASE
COMMANDS IMPOSSIBLE
32 kbyte Flash Module (S12SFTSR32KV1)
MM912F634
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