參數(shù)資料
型號(hào)： UPD17235
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)： 27/92頁(yè)
文件大?。?/td> 378K
代理商： UPD17235
Data Sheet U14360EJ1V0DS00
μ
PD17230, 17231, 17232, 17233, 17234, 17235, 17236
27
2.5.2
Control registers
The control registers consists of a total of 64 nibbles (64 x 4 bits) of the addresses 00H-3FH of the register file.
Of these, however, only 16 nibbles are actually used. The remaining 48 nibbles are unused registers that are
inhibited from being read or written.
When the “PEEK WR, rf” instruction is executed, the contents of the register file addressed by “rf” are read to the
window register.
When the “POKE rf, WR” instruction is executed, the contents of the window register are written to the register
file addressed by “rf”.
When using the assembler (RA17K), the macro instructions listed below, which are embedded as flag type symbol
manipulation instructions, can be used. The macro instructions allow the contents of the register file to be manipulated
in bit units.
For the configuration of the control register, refer to
Figure 11-1 Register File List
.
SETn
CLRn
SKTn
SKFn
NOTn
INITFLG
INITFLGX : Initalizes flag
: Sets flag to “1”
: Sets flag to “0”
: Skips if all flags are “1”
: Skips if all flags are “0”
: Complements flag
: Initializes flag
2.5.3
Notes on using register files
When using the register files, bear in mind the points described below. For details, refer to
μ
PD172xx subseries
User’s Manual (U12795E)
.
(1) When manipulating control registers (read-only and unused registers)
When manipulating the write-only (W), the read-only (R) and unused control registers by using the assembler
or in-circuit emulator, keep in mind the following points:
When device operates
Nothing changes even if data is written to the read-only register.
If the unused register is read, an undefined value is read; nothing is changed even if data is written to this
register.
Using assembler
An error occurs if instruction is excecuted to read data to the write-only register.
An error occurs if an instruction is executed to write data to the read-only register.
An error also occurs if an instruction is executed to read or write the unused address.
When 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 the write-only register is read, and an error does not occur.
Nothing changes even if data is written to the read-only register, and an error does not occur.
An undefined value is read if the unused address is read; nothing changes even if data is written to this
address. An error does not occur.
相關(guān)PDF資料
PDF描述
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