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參數(shù)資料
| 型號： | EM73492 |
| 廠商： | ELAN Microelctronics Corp . |
| 英文描述： | 4-Bit Micro-Controller for Telecom Product(用于通訊產(chǎn)品和家用電器，工作電壓為2.2V-5.5V的4位微控制器) |
| 中文描述： | 4位微控制器的電信產(chǎn)品（用于通訊產(chǎn)品和家用電器，工作電壓為2.2伏至5.5V的4位微控制器） |
| 文件頁數(shù)： | 31/44頁 |
| 文件大小： | 231K |
| 代理商： | EM73492 |
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EM73492
4-BIT MICRO-CONTROLLER FOR TELECOM PRODUCT
31
* This specification are subject to be changed without notice.
7.17.1998
SBR
SIOEND; Check SIO ending; SCSS=0 .
(2b) . To terminate receive 4-bit data by external clock with trailing edge shift mode .
LDIA
#0110b;
OUTA
P31; terminate SIO in external clock receive mode with trailing edge shift type.
SIOEND: TTP P14.3
SBR
SIOEND; Check SIO ending; SCSS=0.
R OPTION FUNCTION FOR I/O PIN
R-option can provide more function for I/O pins. For example, it can be used in keyboard scan for telecom
products. When the key is pressed, this I/O pin is a normal I/O pin. When the key in not pressed and the R-option
function is enabled, this I/O pin can use as input pin to detect external status of this pad.
R-option can provide the Hi-Z function for output driver and use the weak PMOS to pull high. When the R-
option control signal is high, the weak PMOS turns off and the output data latch is in the normal mode. In the
case, there are two mask options (push-pull, open-drain) for this I/O pin. When the R-option control signal is
low, the weak PMOS turns on and the output data latch is Hi-Z. In this case, the input data is low when this pad
connects a 560K
external resistor to GND, and the input data is high when this pad is open outside.
CONTROL OF R OPTION
R-option control signal can be decided by P20.3. When the CPU resets, the initial value is high. in the sleep
mode, P20.3 must be set to high and the output pins with R-option function must be clear to low for power
saving.
P20
3
2
1
0
Initial value : 1 * * *
0
1
*
*
*
*
*
*
:
:
R-option enable
R-option disable
ex
; Normal program
; I/O operation
:
:
Pad
weak PMOS
R-option control signal
Output
data
latch
Output
data
Input
data
Push-pull
Open-drain
mask option
R-option mask option
560K
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