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參數資料
| 型號： | 87C055 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Microcontrollers for TV and video MTV |
| 中文描述： | 電視和視頻微控制器MTV |
| 文件頁數： | 14/40頁 |
| 文件大?。?/td> | 243K |
| 代理商： | 87C055 |
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1996 Mar 22
14
Philips Semiconductors
Product specification
Microcontrollers for TV and video (MTV)
83C145; 83C845
83C055; 87C055
12 SOFTWARE ANALOG-TO-DIGITAL FACILITY
Figure 6 shows the software analog-to-digital facility block diagram. The block includes Special Function Register SAD.
12.1
Special Function Register SAD
Table 12
Special Function Register SAD format (address D8H)
Table 13
Description of SAD bits
7
6
5
4
3
2
1
0
VHi
CH1
CH0
St
SAD3
SAD2
SAD1
SAD0
BIT
SYMBOL
DESCRIPTION
7
6
5
4
VHi
CH1
CH0
St
The comparator output bit; bit addressable.
The channel field controls which pin, if any, is connected to this facility; see Table 14.
The St bit should be written as a logic 1 in order to initiate a voltage comparison.
SAD3 to SAD0 4 LSBs of the SAD register.
3 to 0
12.2
Software ADC operation
Port pins P1.0/ADI0 to P1.2/ADI2 can be alternately
selected as inputs of a linear voltage comparator. The
other input of the comparator is connected to a 4-bit DAC.
This DAC is controlled by bits SAD3 to SAD0 and
produces a reference voltage:
nominally 0.15625 to 4.84375 V in increments of
0.3125 V.
The output of the comparator (HIGH or LOW) can be read
by the program as the MSB of the SAD register i.e. bit VHi.
After writing St = 1, the program should include intervening
instructions totalling at least 6 machine cycles (72 clock
periods or 6
μ
s at 12 MHz), before the instruction that
accesses and tests VHi.
Table 14
Pin selection: P1.n/ADIn
Note
1.
Port 1 has open-drain drivers which will not materially
affect an analog voltage as long as any and all pins
used for software analog-to-digital measurement have
corresponding logic 1s in the port register; n = 0, 1, 2.
CH1
CH0
P1.n/ADIn
(1)
0
0
1
1
0
1
0
1
none
P1.0/ADI0
P1.1/ADI1
P1.2/ADI2
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