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參數資料
| 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： | 12/43頁 |
| 文件大小： | 533K |
| 代理商： | HMS99C51 |
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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
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相關代理商/技術參數 |
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| 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 |
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| 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 |
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