參數(shù)資料
型號(hào): UPD784020GC-3B9
廠商: NEC Corp.
英文描述: 16/8-BIT SINGLE-CHIP MICROCOMPUTER
中文描述: 16/8-BIT單片機(jī)
文件頁數(shù): 29/90頁
文件大?。?/td> 614K
代理商: UPD784020GC-3B9
29
m
PD784020, 784021
Table 8-1 Port Functions
8.2 CLOCK GENERATOR
A circuit for generating the clock signal required for operation is provided. The clock generator includes a frequency
divider; low current consumption can be achieved by operating at a lower internal frequency when high-speed
operation is not necessary.
Fig. 8-2 Block Diagram of Clock Generator
Remark
f
XX
: Oscillator frequency or external clock input
f
CLK
: Internal operating frequency
Port name
Pin
Function
Pull-up specification by software
Port 0
P00-P07
Bit-by-bit input/output setting supported
Operable as 4-bit real-time outputs
(P00-P03, P04-P07)
Capable of driving transistors
Specified as a batch for all pins placed in
input mode.
Port 1
P10-P17
Bit-by-bit input/output setting supported
Capable of driving LEDs
Specified as a batch for all pins placed in
input mode.
Port 2
P20-P27
Input port
Specified for the 6 bits (P22-P27) as a batch.
Port 3
P30-P37
Bit-by-bit input/output setting supported
Specified as a batch for all pins placed in
input mode.
Port 6
P60-P63
Output-only port
P66, P67
Bit-by-bit input/output setting supported
Port 7
P70-P77
Bit-by-bit input/output setting supported
Specified as a batch for all pins placed in
input mode.
X1
X2
f
XX
/2
f
XX
f
CLK
CPU
Peripheral circuits
Oscillator
UART/IOE
INTP0 noise eliminator
Oscillation settling timer
S
1/2
1/2
1/2
1/2
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