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参数资料
| 型号： | EM78459 |
| 英文描述： | Dual Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 14-SOIC |
| 中文描述： | 8位微控制器的通用产品 |
| 文件页数： | 33/57页 |
| 文件大小： | 854K |
| 代理商： | EM78459 |
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EM78458/459
MASK ROM
This specification is subject to change without prior notice.
2002/03/01
39
ComparatorX ( Comparator 1 and Comparator 2 ): To reset TMRX while a match occurs and the
TMRXIF flag is set at the same time.
3. Programming the Related Registers
When defining TMRX, refer to the related registers of its operation as shown in Table 9.It must be
noted that the PWMX bits must be disabled if their related TMRXs are employed. That is, bit 7 and bit
6 of the PWMCON register must be set to ‘0’.
Table 10 Related Control Registers of TMR1 and TMR2
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
IOC51
PWMCON/IOC51
PWM2E
PWM1E
T2EN
T1EN
T2P1
T2P0
T1P1
T1P0
4. Timer programming procedures/steps
(1) Load PRDX with the TIMER period.
(2) Enable interrupt function by writing IOCF0, if required
(3) Load a desired value to PWMCON with the TMRX prescaler value and enable both TMRX and
disable PWMX.
4.10 Comparator
EM78458/459 has one comparator, which has two analog inputs and one output. The comparator can
be employed to wake up from the sleep mode. Fig. 16 shows the circuit of the comparator.
+
-
Cin-
Cin+
CO
CMP
Fig. 16 Comparator Operating Mode
1. External Reference Signal
The analog signal that is presented at Cin- compares to the signal at Cin+, and the digital output (CO)
of the comparator is adjusted accordingly.
The reference signal must be between Vss and Vdd.
The reference voltage can be applied to either pi of comparator.
Threshold detector applications may be of the same reference.
The comparator can operate from the same or different reference source.
2. Comparator Outputs
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