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参数资料
| 型号： | 48e30 |
| 厂商： | Holtek Semiconductor Inc. |
| 英文描述： | 8-Bit I/O Type MCU (With EEPROM) |
| 中文描述： | 8位I / O型微控制器（带EEPROM） |
| 文件页数： | 8/44页 |
| 文件大小： | 351K |
| 代理商： | 48E30 |
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HT48E30
Rev. 0.00
16
January 12, 2004
Preliminary
The PG0 is pin-shared with INT.
It is recommended that unused or not bonded out I/O
lines should be set as output pins by software instruction
to avoid consuming power under input floating state.
Low Voltage Reset
- LVR
The HT48E30 provides a low voltage reset circuit in or-
der to monitor the supply voltage of the device. If the
supply voltage is within the range 0.9V~VLVR, such as
while changing a battery, the LVR will automatically re-
set the device internally.
The LVR includes the following specifications:
Within the low voltage range (0.9V~V
LVR), the device
remains in their original state until exceeding 1ms. If
the low voltage state does not exceed 1ms, the LVR
will ignore it and does not perform a reset function.
The LVR uses the
OR function with the external
RES signal to perform chip reset.
The relationship between VDD and VLVR is shown below.
Note:
VOPR is the voltage range for proper chip opera-
tion at 4MHz system clock.
V D D
P A 0 ~ P A 7
P B 0 ~ P B 7
P C 0 ~ P C 5
P G 0
M
U
X
M
U
X
B Z E N
( P B 0 , P B 1 O n l y )
O P 0 ~ O P 7
I N T f o r P G 0 O n l y
S y s t e m W a k e - u p
( P A o n l y )
R e a d D a t a R e g i s t e r
P B 0
B Z / B Z
( P B 0 , P B 1 O n l y )
D
Q
C K
Q
S
D
Q
C K
Q
S
C o n t r o l B i t
P U
D a t a B u s
W r i t e C o n t r o l R e g i s t e r
C h i p R e s e t
R e a d C o n t r o l R e g i s t e r
W r i t e D a t a R e g i s t e r
D a t a B i t
Input/Output Ports
5 . 5 V
3 . 3 V
2 . 4 V
0 . 9 V
V D D
V O P R
V L V R
5 . 5 V
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