參數(shù)資料
型號(hào)： EM78P468NQ
廠商： ELAN Microelctronics Corp .
元件分類： 8位微控制器
英文描述： 8-BIT MICROCONTROLLER
中文描述： 8位微控制器
文件頁(yè)數(shù)： 30/82頁(yè)
文件大?。?/td> 1491K
代理商： EM78P468NQ
EM78P468N
8-BIT Microcontroller
26
Product Specification (V1.2) 03.15.2005
(This specification is subject to change without further notice)
4.2.19 IOCC1/P6OD (PORT 6 Open Drain Control Register)
(Address: 0Ch, Bit 0 of R5 = “1”)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
OP67
OP66
OP65
OP64
OP63
OP62
OP61
OP60
Bit 7 ~ Bit 0:
The enable bits of PORT 6 open drain function.
OD6x = “0”:
disable pin of P6.x open drain function
OD6x = “1”:
enable pin of P6.x open drain function
4.2.20 IOCD1/P8PH (PORT 8 Pull High Control Register)
(Address: 0Dh, Bit 0 of R5 = “1”)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PH87
PH86
PH85
PH84
PH83
PH82
PH81
PH80
Bit 7 ~ Bit 0:
The enable bits of PORT 8 pull-high function.
PH8x = ”0”:
disable pin of P8.x internal pull-high resistor function
PH8x = “1”:
enable p
n
4.2.21 IOCE1/P6PL (PORT 6 Pull-Low Control Register)
(Address: 0Eh, Bit 0 of R5 = “1”)
Bit 7
Bit 6
Bit 5
in of P8.x pull-high resistor functio
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PL67
PL66
PL
PL61
PL60
65
PL64
PL63
PL62
Bit 7 ~ Bit 0:
The enable bits of PORT 6 pull low function.
PL6x = “0”:
disable pin of P6.x internal pull-low resistor function
PL6x = “1”:
enable pin of P6.x internal pull-low resistor function
4.3 TCC and WDT Pre-scaler
Two 8-bit counters are available as pre-scalers for the TCC (Time Clock Counter) and
WDT (Watch Dog Timer). The TCCP2~TCCP0 bits of the IOC71 register are used to
determine the ratio of the TCC pre-scaler. Likewise, the WDTP2~WDTP0 bits of the
IOC81 register are used to determine the WDT pre-scaler. The TCC pre-scaler
(TCCP2~TCCP0) is cleared by the instructions each time they are written into TCC,
while the WDT pre-scaler is cleared by the “WDTC” and “SLEP” instructions. Fig.7
depicts the circuit diagram of TCC and WDT.
R1 (TCC) is an 8-bit timer/counter. The clock source of TCC can be selected by internal
instruction clock or external signal input (edge selectable from the TCC control register).
If TCC signal source is from internal instruction clock, TCC will increase by 1 at every
instruction cycle (without pre-scaler). If TCC signal source is from external clock input,
TCC will increase by 1 at every falling edge or rising edge of the TCC pin.
The watchdog timer is a free running on sub-oscillator. The WDT will keep on running
even after the oscillator driver has been turned off. During Normal mode, Green mode, or
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