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參數(shù)資料
| 型號(hào)： | TC9028P |
| 元件分類： | 搖控器 |
| 英文描述： | INFRARED, TRANSMITTER IC, PDIP20 |
| 封裝： | 0.300 INCH, 2.54 MM PITCH, PLASTIC, DIP-20 |
| 文件頁數(shù)： | 20/21頁 |
| 文件大小： | 571K |
| 代理商： | TC9028P |
TC9028P/F
2002-01-08
8
2.10.3
Instruction cycle
Instructions and internal hardware operations are executed in sync with the fundamental clock.
The minimum unit of instruction execution is called the instruction cycle. TC9028P and TC9028F
has 1 and 2-cycle instructions. An instruction cycle consists of 5 states (S0-S4). Each state consists
of 1 fundamental clock. Therefore, the instruction cycle time is 5/fc (s).
3. Peripheral hardware functions
3.1
Ports
The following functions are executed using I/O instructions (4 types):
key scan, send signal output, send display output, internal circuit control.
This system features the 2 types of ports listed below. Addresses (00-05H) are allocated to these ports:
(1) I/O ports: key scan, send signal output, send display output
(2) Command register: internal circuit control
Ports are selected by specifying port addresses with I/O instructions. The port register controls input
and output of programmable I/O ports.
3.1.1
Port register (PR)
The port register is a 4 bit write-only register. It is used for selecting input or output mode for
programmable I/O ports. Since an option is used to select input or output mode during hold, the
port register cannot select the mode.
Figure 3.1 Programmable I/O port control using port register
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