參數(shù)資料
型號： UPD75004
廠商： NEC Corp.
英文描述： 4-BIT SINGLE-CHIP MICROCOMPUTER
中文描述： 4位單片機
文件頁數(shù)： 20/66頁
文件大?。?/td> 542K
代理商： UPD75004
μ
PD75004, 75006, 75008
20
5.
PERIPHERAL HARDWARE FUNCTIONS
5.1
PORTS
I/O ports are classified into the following 3 kinds:
CMOS input (PORT0, 1)
CMOS input/output (PORT2, 3, 6, 7, and 8) : 18
N-ch open-drain input/output (PORT4, 5)
:
8
:
8
Total
: 34
Remarks
Multiplexed with SO/SB0,
SI/SB1, SCK, INT0-2, 4,
and TIO
Port 6 is multiplexed with
KR0 to KR3.
Port 2 is multiplexed with
PTO0, PCL, and BUZ.
Port 7 is multiplexed with
KR4-KR7.
Can be connected to a
pull-up resistor in 1-bit
units by using mask
option.
—
PORT0
PORT1
PORT3*
PORT6
PORT2
PORT7
PORT4*
PORT5*
PORT8
Function
4-bit input
4-bit input/output
4-bit input/output
(N-ch open-drain,
10 V)
2-bit input/output
Table 5-1 Port Function
Operation and Feature
Can be always read or tested regardless of opera-
tion mode of multiplexed pin.
Can be set in input or output mode in 1-bit units.
Can be set in input or output mode in 4-bit units.
Ports 6 and 7 are used in pairs to input/output data
in 8-bit units.
Can be set in input or output mode in 4-bit units.
Ports 4 and 5 are used in pairs to input/output data
in 8-bit units.
Can be set input or output mode in 2-bit units.
*: Can directly drive LED.
Port Name
(Symbol)
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