參數(shù)資料
型號： UPD75304BGC
廠商： NEC Corp.
英文描述： 4-BIT SINGLE-CHIP MICROCOMPUTER
中文描述： 4位單片機(jī)
文件頁數(shù)： 16/76頁
文件大?。?/td> 572K
代理商： UPD75304BGC
16
μ
PD75304B,75306B,75308B
3.5
PRECAUTIONS CONCERNING P00/INT4 PIN AND RESET PIN
In addition to the functions shown in 3.1 and 3.2, the P00/INT4 pin and RESET pin are also used to set the
test mode for testing internal
μ
PD75308B operation (for IC testing).
The test mode is set when a voltage greater than V
DD
is applied to either of these pins. Consequently, if
noise exceeding V
DD
is applied during normal operation, the test mode may be entered, making it impossible
for normal operation to continue.
For example, misoperation may result if inter-wiring noise is applied to the P00/INT4 or RESET pin due to
the length of the wiring from these pins, and the pin voltage exceeds V
DD
.
Wiring should therefore be carried out so that inter-wiring noise is suppressed as far as possible. If it is
completely impossible to suppress noise, noise prevention measures should be taken using an external compo-
nent as shown below.
o
Diode connected between
P00/INT4 or RESET and V
DD
o
Capacitor connected between
P00/INT4 or RESET and V
DD
Diode with
Small V
F
V
DD
V
DD
V
DD
P00/INT4, RESET
V
DD
P00/INT4, RESET
4. MEMORY CONFIGURATION
Program memory (ROM) ... 8064
×
8 bits (0000H to 1F7FH):
μ
PD75308B
6016
×
8 bits (0000H to 177FH):
μ
PD75306B
4096
×
8 bits (0000H to 0FFFH):
μ
PD75304B
0000H to 0001H: Vector table in which the program start address after a reset is written.
0002H to 000BH: Vector table in which program start addresses in case of interrupts are written.
0020H to 007FH: Table area referenced by the GETI instruction.
Data memory
Data area ... 512
×
4 bits (000H to 1FFH)
Peripheral hardware area ... 128
×
4 bits (F80H to FFFH)
#
相關(guān)PDF資料
PDF描述
UPD75304BGF 4-BIT SINGLE-CHIP MICROCOMPUTER
UPD75304BGK 4-BIT SINGLE-CHIP MICROCOMPUTER
UPD75306B 4-BIT SINGLE-CHIP MICROCOMPUTER
UPD75306BGC 4-BIT SINGLE-CHIP MICROCOMPUTER
UPD75306BGF 4-BIT SINGLE-CHIP MICROCOMPUTER
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