參數(shù)資料
型號(hào)： UPD17228MC
廠商： NEC Corp.
元件分類(lèi)： 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(yè)數(shù)： 21/84頁(yè)
文件大?。?/td> 393K
代理商： UPD17228MC
μ
PD17225, 17226, 17227, 17228
21
Data Sheet U12643EJ2V0DS00
(3) Note on using data buffer
When transferring data to/from the peripheral hardware via the data buffer, the unused peripheral addresses,
write-only peripheral registers (only when executing PUT), and read-only peripheral registers (only when
executing GET) must be handled as follows:
When device operates
Nothing changes even if data is written to the read-only register.
If the unused address is read, an undefined value is read. Nothing changes even if data is written to that
address.
Using assembler
An error occurs if an instruction is executed to read a write-only register.
Again, an error occurs if an instruction is executed to write data to a read-only register.
An error also occurs if an instruction is executed to read or write an unused address.
If an in-circuit emulator (IE-17K or IE-17K-ET)
is used
(when instruction is executed for patch processing)
An undefined value is read if an attempt is made to read the data of a write-only register, but an error does
not occur.
Nothing changes even if data is written to a read-only register, and an error does not occur.
An undefined value is read if an unused address is read; nothing changes even if data is written to this
address. An error does not occur.
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