MC68HC912B32CFU8 Freescale Semiconductor, MC68HC912B32CFU8 Datasheet - Page 88

• Manufacturer Part Number: MC68HC912B32CFU8
• Description: IC MCU 32K FLASH 8MHZ 80-QFP
• Manufacturer: Freescale Semiconductor
• Series: HC12r

Specifications of MC68HC912B32CFU8

• Core Processor: CPU12
• Core Size: 16-Bit
• Speed: 8MHz
• Connectivity: SCI, SPI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 63
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 768 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Bus Control and Input/Output (I/O)
6.3.5 Port E Data Register
Read: Anytime, if register is in the map
Write: Anytime, if register is in the map
This register is associated with external bus control signals and interrupt inputs including:
When the associated pin is not used for one of these specific functions, the pin can be used as
general-purpose I/O. The port E assignment register (PEAR) selects the function of each pin. DDRE
determines the primary direction of each port E pin when configured to be general-purpose I/O.
Some of these pins have software selectable pullups (DBE, LSTRB, R/W, and XIRQ). A single control bit
enables the pullups for all these pins which are configured as inputs. IRQ always has a pullup.
This register is not in the map in peripheral mode or expanded modes when the EME bit is set.
6.3.6 Port E Data Direction Register
Read: Anytime, if register is in the map
Write: Anytime, if register is in the map
This register determines the primary direction for each port E pin configured as general-purpose I/O.
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1 = Associated pin is an output.
0 = Associated pin is a high-impedance input.
Data bus enable (DBE)
Mode select (MODB/IPIPE1 and MODA/IPIPE0)
E clock
Data size (LSTRB/TAGLO)
Read/write (R/W)
IRQ
XIRQ
Alternate function:
Address: $0009
Reset:
Read:
Write:
Address: $0008
Reset:
Read:
Write:
DDE7
Bit 7
0
Figure 6-6. Port E Data Direction Register (DDRE)
Bit 7
DBE
PE7
0
Figure 6-5. Port E Data Register (PORTE)
= Unimplemented
DDE6
6
0
MODB or
IPIPE1
M68HC12B Family Data Sheet, Rev. 9.1
PE6
6
0
DDE5
5
0
MODA or
IPIPE0
PE5
5
0
DDE4
4
0
ECLK
PE4
4
0
DDE3
3
0
LSTRB or
TAGLO
PE3
3
0
DDE2
2
0
PE2
R/W
2
0
1
0
0
PE1
IRQ
1
0
Freescale Semiconductor
Bit 0
0
0
XIRQ
Bit 0
PE0
0