MC812A4CPVE8 Freescale Semiconductor, MC812A4CPVE8 Datasheet - Page 106

• Manufacturer Part Number: MC812A4CPVE8
• Description: IC MCU 16BIT EEPROM 4K 112-LQFP
• Manufacturer: Freescale Semiconductor
• Series: HC12r

Specifications of MC812A4CPVE8

• Core Processor: CPU12
• Core Size: 16-Bit
• Speed: 8MHz
• Connectivity: SCI, SPI
• Peripherals: POR, WDT
• Number Of I /o: 83
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: EEPROM
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 112-LQFP
• Processor Series: HC812A
• Core: HC12
• Data Bus Width: 16 bit
• Data Ram Size: 1 KB
• Interface Type: SCI, SPI
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 91
• Number Of Timers: 8
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit, 8 Channel
• Controller Family/series: 68HC12
• No. Of I/o's: 91
• Eeprom Memory Size: 4KB
• Ram Memory Size: 1KB
• Cpu Speed: 8MHz
• No. Of Timers: 1
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

Clock Module
RTIE — Real-Time Interrupt Enable Bit
Write: Anytime
RSWAI — RTI Stop in Wait Bit
Write: Once in normal modes, anytime in special modes
RSBCK — RTI Stop in Background Mode Bit
Write: Once in normal modes, anytime in special modes
RTBYP — RTI Bypass Bit
Write: Never in normal modes, anytime in special modes
RTR2, RTR1, RTR0 — Real-Time Interrupt Rate Select Bits
Write: Anytime
106
RTIE enables interrupt requests generated by the RTIF flag.
RSWAI disables the RTI and the COP during wait mode.
RSBCK disables the RTI and the COP during background debug mode.
RTBYP allows faster testing by causing the divider chain to be bypassed. The divider chain normally
divides M by 2
Rate select for real-time interrupt. The clock used for this module is the module (M) clock.
1 = RTIF interrupt requests enabled
0 = RTIF interrupt requests disabled
1 = RTI and COP disabled in wait mode
0 = RTI and COP enabled in wait mode
1 = RTI and COP disabled during background mode
0 = RTI and COP enabled during background mode
1 = Divider chain bypass
0 = No divider chain bypass
13
. When RTBYP is set, the divider chain divides M by 4.
RTR[2:1:0]
000
001
010
011
100
101
110
111
Table 10-2. Real-Time Interrupt Rates
M-Clock Divisor
MC68HC812A4 Data Sheet, Rev. 7
2
2
2
2
2
2
2
Off
13
14
15
16
17
18
19
M = 4.0 MHz
Real-Time Timeout Period
16.384 ms
32.768 ms
65.536 ms
131.72 ms
2.048 ms
4.096 ms
8.196 ms
Off
M = 8.0 MHz
16.384 ms
32.768 ms
65.536 ms
1.024 ms
2.048 ms
4.096 ms
8.196 ms
Off
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