MC68HC912B32VFU8 Freescale Semiconductor, MC68HC912B32VFU8 Datasheet - Page 88

• Manufacturer Part Number: MC68HC912B32VFU8
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC912B32VFU8

• Cpu Family: HC12
• Device Core Size: 16b
• Frequency (max): 8MHz
• Interface Type: SCI/SPI
• Program Memory Type: EPROM
• Program Memory Size: 32KB
• Total Internal Ram Size: 1KB
• # I/os (max): 63
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 4.5V
• On-chip Adc: 8-chx10-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 105C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 80
• Package Type: PQFP
• Lead Free Status / Rohs Status: Not 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