EM78P468LAQ EMC [ELAN Microelectronics Corp], EM78P468LAQ Datasheet - Page 25

• Manufacturer Part Number: EM78P468LAQ
• Description: 8-BIT Microcontroller
• Manufacturer: EMC [ELAN Microelectronics Corp]

Product Specification (V1.0) 03.15.2006
(This specification is subject to change without further notice)
4.2.4
4.2.5
4.2.6
4.2.7
4.2.8
Bit 7 (IOC67)~Bit 0(IOC60): PORT 6 I/O direction control register
Bit 7 (IOC77)~Bit 0(IOC70): PORT 7 I/O direction control register
Bit 7 (IOC 87)~Bit 0(IOC 80): PORT 8 I/O direction control register
Bit 7: Not used, fixed at “0”
Bit 6~0: 128 bytes RAM address
Bit 7~0: 128 bytes RAM data transfer register
Bit 7 ~ Bit 0: All are Counter 1 buffer that user can read and write. The Counter 1 is an
8-bit down-count timer with 8-bit pre-scaler that is used as this register to preset the
RAM_D7 RAM_D6 RAM_D5 RAM_D4 RAM_D3 RAM_D2 RAM_D1 RAM_D0
IOC77
IOC87
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
0
IOC6x =”0”: set the relative PORT6.x I/O pins as output
IOC6x =”1”: set the relative PORT6.x I/O pin into high impedance (input pin)
IOC7x = “0”: set the relative PORT7.x I/O pins as output
IOC7x = “1”: set the relative PORT7.x I/O pin into high impedance (input pin)
IOC8x = “0”: set the relative PORT8.x I/O pins as output
IOC8x = “1”: set the relative PORT8.x I/O pin into high impedance (input pin)
IOC70/P7CR (PORT 7 I/O Control Register)
(Address: 07h, Bit 0 of R5 = “0”)
IOC80/P8CR (PORT 8 I/O Control Register)
(Address: 08h, Bit 0 of R5 = “0”)
IOC90/RAM_ADDR (128 Bytes RAM Address)
(Address: 09h, Bit 0 of R5 = “0”)
IOCA0/RAM_DB (128 Bytes RAM Data Buffer)
(Address: 0Ah, Bit 0 of R5 = “0”)
IOCB0/CNT1PR (Counter 1 Preset Register)
(Address: 0Bh, Bit 0 of R5 = “0”)
RAM_A6 RAM_A5 RAM_A4 RAM_A3 RAM_A2 RAM_A1 RAM_A0
IOC76
IOC86
Bit 6
Bit 6
Bit 6
Bit 6
Bit 6
Bit 6
IOC75
IOC85
Bit 5
Bit 5
Bit 5
Bit 5
Bit 5
Bit 5
IOC74
IOC84
Bit 4
Bit 4
Bit 4
Bit 4
Bit 4
Bit 4
IOC73
IOC83
Bit 3
Bit 3
Bit 3
Bit 3
Bit 3
Bit 3
IOC72
IOC82
Bit 2
Bit 2
Bit 2
Bit 2
Bit 2
Bit 2
8-BIT Microcontroller
IOC71
IOC81
Bit 1
Bit 1
Bit 1
Bit 1
Bit 1
Bit 1
EM78P468L
IOC70
IOC80
Bit 0
Bit 0
Bit 0
Bit 0
Bit 0
Bit 0
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