參數(shù)資料
型號(hào)： UPD17201A
廠商： NEC Corp.
英文描述： 4-BIT SINGLE-CHIP MICROCONTROLLER WITH LCD CONTROLLER/DRIVER AND A/D CONVERTER FOR INFRARED REMOTE CONTROL TRANSMITTERS
中文描述： 4位單片機(jī)與LCD控制器/驅(qū)動(dòng)器和A / D轉(zhuǎn)換器紅外遙控遞質(zhì)
文件頁數(shù)： 26/120頁
文件大小： 516K
代理商： UPD17201A
μ
PD17201A, 17207
26
4.5.2
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 20 nibbles are actually used. The remaining 44 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 17K series assembler, 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 Fig. 15-1 Register File List.
SETn
CLRn
SKTn
SKFn
NOTn
INITFLG : Initializes flag
: Sets flag to “1”
: Sets flag to “0”
: Skips if all flags are “1”
: Skips if all flags are “0”
: Complements flag
4.5.3
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
.
(1) When manipulating control registers (read-only and unused registers)
When manipulating 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 17K series assembler
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)
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.
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