參數(shù)資料
型號(hào)： UPD754264
廠商： NEC Corp.
英文描述： 4-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述： 4位單晶片微控制器
文件頁(yè)數(shù)： 17/68頁(yè)
文件大?。?/td> 318K
代理商： UPD754264
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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