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參數(shù)資料
| 型號(hào)： | UPD753304W |
| 廠商： | NEC Corp. |
| 元件分類： | 4位微控制器 |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| 中文描述： | 4位單片機(jī)的小型通用紅外遙控器 |
| 文件頁數(shù)： | 18/56頁 |
| 文件大小： | 374K |
| 代理商： | UPD753304W |
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18
μ
PD753304
6. PERIPHERAL HARDWARE FUNCTION
6.1 Digital I/O Port
There are three kinds of I/O port.
CMOS input/output ports (PORT 3, 8, 10): 12
Table 6-1. Types and Features of Digital Ports
Port
Function
Operation & features
Remarks
PORT3
4-bit I/O
Can be set to input mode or output mode in 1-bit unit.
Also used for the PCL and
BUZ pins.
PORT8
Can be set to input mode or output mode in 4-bit units.
Also used for the S20 to S23
pins.
PORT10
Can be set to input mode or output mode in 1-bit unit.
Also used for the INT1 pin.
6.2 Clock Generator
The clock generator is a device that generates the clock fed to peripheral hardware on the CPU and is configured
as shown in Figure 6-1.
The clock generator operates according to how the processor clock control register (PCC) and system clock
control register (SCC) are set.
There are two kinds of clocks, main system clock and subsystem clock.
The instruction execution time can also be changed.
1.1, 2.2, 4.4, 17.8
μ
s (main system clock: in 3.6-MHz operation)
85.1
μ
s (subsystem clock: in 47-kHz operation)
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