參數(shù)資料
型號: μPD754264
廠商: NEC Corp.
英文描述: 4 Bit RISC Microcontrollers(4 位單片微控制器)
中文描述: 4位RISC微控制器(4位單片微控制器)
文件頁數(shù): 17/68頁
文件大?。?/td> 320K
代理商: ΜPD754264
17
μ
PD754264
7. PERIPHERAL HARDWARE FUNCTIONS
7.1
Digital Input/Output Ports
The following two types of I/O ports are provided.
CMOS input (Port 7)
CMOS I/O (Ports 3, 6, 8)
Total
:
:
:
4
9
13
Table 7-1. Types and Features of Digital Ports
Port Name
Function
Operation and Features
Remarks
PORT3
4-bit I/O
Can be set to input or output mode bit-wise.
Also used as PTO0 to PTO2 pins.
PORT6
Also used as AVREF, INT0, AN0, and
AN1 pins.
PORT7
4-bit input
4-bit input only port
On-chip pull-up resistor connection can be specified
by mask option bit-wise.
Also used as KR4 to KR7 pins.
PORT8
1-bit I/O
Can be set to input or output mode bit wise.
7.2 Clock Generator
The clock generator provides the clock signals to the CPU and peripheral hardware. Its configuration is shown
in Figure 7-1.
The operation of the clock generator is set with the processor clock control register (PCC).
The instruction execution time can be changed.
0.95, 1.91, 3.81, 15.3
μ
s (when the system clock f
X
operates at 4.19 MHz)
0.67, 1.33, 2.67, 10.7
μ
s (when the system clock f
X
operates at 6.0 MHz)
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