參數(shù)資料
型號： UPD754202A
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
文件頁數(shù)： 17/66頁
文件大?。?/td> 302K
代理商： UPD754202A
17
μ
PD754202, 754202(A)
6. PERIPHERAL HARDWARE FUNCTION
6.1 Digital I/O Port
The following two types of I/O ports are provided.
CMOS Input (PORT7)
CMOS Input/Output (PORT3, 6, 8) :
Total
:
4
9
13
Table 6-1. 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 for PTO0 to PTO2
pins.
PORT6
Also used for INT0 pin.
PORT7
4-bit input
4-bit input only port
On-chip pull-up resistor can be specified by mask
option bit-wise.
Also used for KR4 to KR7 pins.
PORT8
1-bit I/O
Can be set to input or output mode bit-wise.
–
6.2 Clock Generator
The clock generator provides the clock signals to the CPU and peripheral hardware. Its configuration is shown
in Figure 6-1.
The operation of the clock generator is set with the processor clock control register (PCC). The instruction
execution time can be changed as follows.
0.95, 1.91, 3.81, 15.3
μ
s (system clock operating at 4.19 MHz)
0.67, 1.33, 2.67, 10.7
μ
s (system clock operating at 6.0 MHz)
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