- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385388 > HMS99C51 (Hynix Semiconductor Inc.) 8-BIT SINGLE-CHIP MICROCONTROLLERS PDF資料下載
參數(shù)資料
| 型號： | HMS99C51 |
| 廠商： | Hynix Semiconductor Inc. |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-BIT SINGLE-CHIP MICROCONTROLLERS |
| 中文描述： | 8位單晶片微控制器 |
| 文件頁數(shù)： | 12/43頁 |
| 文件大?。?/td> | 533K |
| 代理商： | HMS99C51 |
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頁當前第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
HMS99C5X Series
8
Jan. 2003 Ver 1.0
ALE /
PROG
33
30
27
O
The Address Latch Enable / Program pulse
Output pulse for latching the low byte of the address
during an access to external memory. In normal
operation, ALE is emitted at a constant rate of 1/6 the
oscillator frequency, and can be used for external
timing or clocking. Note that one ALE pulse is skipped
during each access to external data memory. This pin
is also the program pulse input (PROG) during
EPROM programming.
If desired, ALE operation can be disabled by setting
bit 0 of SFR location 8E
H
. With this bit set, the pin is
weakly pulled high. The ALE disable feature will be
terminated by reset. Setting the ALE-disable bit has
no affect if the microcontroller is in external execution
mode.
EA / V
PP
35
31
29
I
External Access Enable / Program Supply Voltage
EA must be external held low to enable the device to
fetch code from external program memory locations
0000
H
to FFFF
H
. If EA is held high, the device
executes from internal program memory unless the
program counter contains an address greater than its
internal memory size. This pin also receives the
12.75V programming supply voltage (V
PP
) during
EPROM programming.
Note;
however, that if any of the Lock bits are
programmed, EA will be internally
latched on reset.
P0.0-P0.7
36-43
32-39
30-37
I/O
Port 0
Port 0 is an 8-bit open-drain bidirectional I/O port.
Port 0 pins that have 1s written to them float and can
be used as high-impedance inputs.
Port 0 is also the multiplexed low-order address and
data bus during accesses to external program and
data memory. In this application it uses strong internal
pull-ups when emitting 1s. Port 0 also outputs the
code bytes during program verification in the
GMS97X5X. External pull-up resistors are required
during program verification.
V
SS
22
20
16
-
Circuit ground potential
V
CC
44
40
38
-
Supply terminal
for all operating modes
N.C.
1,12
23,34
-
6,17
28,39
-
No connection
Symbol
Pin Number
Input/
Output
Function
PLCC-
44
PDIP-
40
MQFP-
44
相關PDF資料 |
PDF描述 |
|---|---|
| HMS99C52 | 8-BIT SINGLE-CHIP MICROCONTROLLERS |
| HMS9XC7132 | DATA SHEET REV.2.0(PRELIMINARY) |
| HMU16GC-35 | 16 x 16-Bit CMOS Parallel Multipliers |
| HMU16GC-45 | 16 x 16-Bit CMOS Parallel Multipliers |
| HMU17GC-35 | 16 x 16-Bit CMOS Parallel Multipliers |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| HMS99C51S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT SINGLE-CHIP MICROCONTROLLERS WITH EMBEDDED FLASH |
| HMS99C52 | 制造商:HYNIX 制造商全稱:Hynix Semiconductor 功能描述:8-BIT SINGLE-CHIP MICROCONTROLLERS |
| HMS99C52S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT SINGLE-CHIP MICROCONTROLLERS WITH EMBEDDED FLASH |
| HMS99C54S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT SINGLE-CHIP MICROCONTROLLERS WITH EMBEDDED FLASH |
| HMS99C56S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT SINGLE-CHIP MICROCONTROLLERS WITH EMBEDDED FLASH |
發(fā)布緊急采購，3分鐘左右您將得到回復。