參數(shù)資料
型號: μPD789012
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8位單片微控制器)
中文描述: 8位單片機微控制器(8位單片微控制器)
文件頁數(shù): 12/44頁
文件大小: 271K
代理商: ΜPD789012
μ
PD789011, 789012
12
5. PERIPHERAL HARDWARE FUNCTIONS
5.1 Ports
The
μ
PD789011 and 789012 are provided with the ports shown below, which enable various types of control.
Table 5-1. Port Functions
Name
Pin Name
Function
Port 0
P00 to P07
8-bit input/output port. Input/output can be specified bit-wise.
When used as an input port, on-chip pull-up resistor can be used by software.
Port 1
P10 to P17
8-bit input/output port. Input/output can be specified bit-wise.
When used as an input port, on-chip pull-up resistor can be used by software.
Port 2
P20 to P22
3-bit input/output port. Input/output can be specified bit-wise.
When used as an input port, on-chip pull-up resistor can be used by software.
Port 3
P30 to P32
3-bit input/output port. Input/output can be specified bit-wise.
When used as an input port, on-chip pull-up resistor can be used by software.
5.2 Clock Generator
The main system clock generator is incorporated. Also, the minimum instruction execution can be changed.
0.4
μ
s/1.6
μ
s (at 5.0-MHz operation with main system clock)
Figure 5-1. Clock Generator Block Diagram
X1
STOP
X2
Main System
Clock
Oscillator
f
X
Prescaler
f
X
2
2
Prescaler
Clock to
Peripheral
Hardware
CPU Clock
(f
CPU
)
Standby
Control
Circuit
Wait
Control
Circuit
S
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