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GMS90C32 参数 Datasheet PDF下载

GMS90C32图片预览
型号: GMS90C32
PDF下载: 下载PDF文件 查看货源
内容描述: 8位单芯片微控制器 [8-BIT SINGLE-CHIP MICROCONTROLLERS]
分类和应用: 微控制器
文件页数/大小: 59 页 / 764 K
品牌: HYNIX [ HYNIX SEMICONDUCTOR ]
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GMS90 Series  
Pin Number  
Input/  
Symbol  
Function  
PLCC-  
44  
PDIP-  
40  
MQFP-  
44  
Output  
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.  
ALE /  
PROG  
33  
30  
27  
O
In GMS9XC54/56/58:  
If desired, ALE operation can be disabled by setting  
bit 0 of SFR location 8EH. 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 / VPP  
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  
0000H to FFFFH. 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 (VPP) during  
EPROM programming.  
Note;  
however, that if any of the Lock bits are  
programmed, EA will be internally  
latched on reset.  
Port 0  
P0.0-P0.7  
36-43  
32-39  
30-37  
I/O  
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.  
VSS  
VCC  
N.C.  
22  
44  
20  
40  
-
16  
38  
-
-
-
Circuit ground potential  
Supply terminal  
No connection  
for all operating modes  
1,12  
23,34  
6,17  
28,39  
10  
Dec. 1998 Ver 3.0