EM78P468NBQ EMC [ELAN Microelectronics Corp], EM78P468NBQ Datasheet - Page 24

• Manufacturer Part Number: EM78P468NBQ
• Description: 8-BIT Microcontroller
• Manufacturer: EMC [ELAN Microelectronics Corp]

EM78P468N
8-BIT Microcontroller
20 •
4.2.4
4.2
4.2
4.2.7
4.2
.5
.6
.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 7: Not used,
Bit 6~0: 128 bytes RAM address
Bit 7~0: 128 bytes RAM data transfer register
Bit 7 ~ Bit 0: All are Counter 1
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
IOC
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 imp
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)
87
IOC90/RAM_ADDR (128 Bytes RAM Address)
IOCA0/RAM_DB (128 Bytes RAM D
IOCB0/CNT1PR (Counter 1 Preset Register)
IO
(A
IOC80/P8CR (PORT 8 I/O Control Register
(Address: 08h, Bit
(Address: 09h, Bit 0 of R5 = “0”)
(A
(Address: 0Bh, Bit 0 of R5 = “0”)
C70
ddr
ddr
RAM_A6 RAM_A5 RAM_A4 RAM_A3 RAM_A2 RAM_A1 RAM_A0
IOC76
IOC86
ess:
ess:
)~Bit 0
Bit 6
Bit 6
Bit 6
Bit 6
Bit 6
Bit 6
/P7C
fixed at “0”
07h
0Ah
R (
(IOC 8
IOC75
IOC85
PORT
, Bit
Bit 5
Bit 5
Bit 5
Bit 5
Bit 5
Bit 5
, Bit
0):
0 of
0 of R5 = “0”)
PORT 8 I/O dire
0 o
7
buffer that user can
I/O Co
IOC74
IOC84
f R5 =
Bit 4
Bit 4
Bit 4
Bit 4
Bit 4
Bit 4
R5 =
(This specification is subject to change without further notice)
ntr
“0
“0
IOC73
IOC8
”)
”)
Bit 3
Bit 3
Bit 3
Bit 3
Bit 3
ol Re
Bit 3
ction control regi
Product Specification (V1.2) 03.15.2005
3
ata Buffer)
read and write. The Counter 1 is an
gis
IOC72
IOC82
Bit 2
Bit 2
Bit 2
Bit 2
Bit 2
ter)
Bit 2
)
ster
edance (input pin)
IOC71
IOC81
Bit 1
Bit 1
Bit 1
Bit 1
Bit 1
Bit 1
IOC70
IOC80
Bit 0
Bit 0
Bit 0
Bit 0
Bit 0
Bit 0