- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄379503 > UPD7554AGA (NEC Corp.) 4-BIT SINGLE-CHIP MICROCOMPUTER PDF資料下載
參數(shù)資料
| 型號： | UPD7554AGA |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCOMPUTER |
| 中文描述： | 4位單片機 |
| 文件頁數(shù)： | 29/64頁 |
| 文件大?。?/td> | 991K |
| 代理商： | UPD7554AGA |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁當前第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁
29
μ
PD7554A, 7554A(A)
4.
RESET FUNCTIONS
The
μ
PD7554A is reset and initialized when the RESET pin inputs a high or active RESET signal as follows:
4.1
DETAILS OF INITIALIZATION
(1) The program counter (PC9-PC0) is cleared to zero.
(2) The skip flags (SK1 and SK0) in the program status word are reset to zero.
(3) The count register in the timer-event counter is cleared to 00H.
(4) The clock control circuit becomes as follows:
Clock mode registers (CM2 and CM1) = 0
1
CP = CL
×
–––––
256
Prescalers 1, 2, and 3 = 0
(5) The shift mode register (SM3 to SM1) is cleared to zero.
→
Shifting of the serial interface is stopped.
→
The port 0 enters the input mode (high impedance).
Note1
→
INT0/S, INTS is selected.
(6) The test request flag (INTT RQF or INT0/S RQF) is reset to zero.
(7) The contents of the data memory and the following registers become undefined:
Stack pointer (SP)
Accumulator (A)
Carry flag (C)
General registers (H and L)
Output latch of each port
(8) The output buffer of every port goes off and has high impedance
Note2
. The I/O port enters the input mode.
Note1.
When the pull-up and pull-down resistors are selected using a mask option, the former has high level and
the latter has low level.
2.
When the pull-up and pull-down resistors are selected in the port 0 using a mask option, the former has
high level and the latter has low level.
When the pull-up resistor is selected in the ports 10 and 11 using a mask option, the resistor has high level.
Caution
When the STANDBY mode is cancelled by the RESET signal, the content of the data memory is retained
without becoming undefined.
When the RESET input is cancelled, the program is executed starting with address 000H. The content of each
register shall either be initialized in the process of the program or reinitialized depending on conditions.
相關PDF資料 |
PDF描述 |
|---|---|
| UPD7554A | 4-BIT SINGLE-CHIP MICROCOMPUTER |
| UPD7554AA | 4-BIT SINGLE-CHIP MICROCOMPUTER |
| UPD7554ACS | 4-BIT SINGLE-CHIP MICROCOMPUTER |
| UPD7554AG | 4-BIT SINGLE-CHIP MICROCOMPUTER |
| UPD75CG08E | 4 BIT SINGLE CHIP CMOS MICROCOMPUTERS |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| UPD7566CS044 | 制造商:Panasonic Industrial Company 功能描述:IC |
| UPD75P0016CU | 制造商:Renesas Electronics Corporation 功能描述:MCU 4-Bit 75XL CISC 16KB EPROM 2.5V/3.3V/5V 42-Pin SPDIP |
| UPD75P0016CU-A | 制造商:Renesas Electronics Corporation 功能描述:MCU 4-Bit 75XL CISC 16KB EPROM 2.5V/3.3V/5V 42-Pin SPDIP 制造商:Renesas Electronics 功能描述:75XL 6MHz Cut Tape 制造商:Renesas 功能描述:MCU 4-Bit 75XL CISC 16KB EPROM 2.5V/3.3V/5V 42-Pin SPDIP |
| UPD75P0016GB-3BS-MTX | 制造商:Renesas Electronics 功能描述:MCU 4-Bit 75XL CISC 16KB EPROM 2.5V/3.3V/5V 44-Pin PQFP |
| UPD75P0016GB-3BS-MTX-A | 制造商:Renesas Electronics Corporation 功能描述:MCU 4-bit 75XL CISC 16KB EPROM 2.5V/3.3V/5V 44-Pin PQFP 制造商:Renesas 功能描述:MCU 4-bit 75XL CISC 16KB EPROM 2.5V/3.3V/5V 44-Pin PQFP |
發(fā)布緊急采購，3分鐘左右您將得到回復。