參數(shù)資料
型號(hào): UPD75108A
廠商: NEC Corp.
英文描述: 4-BIT SINGLE-CHIP MICROCOMPUTER
中文描述: 4位單片機(jī)
文件頁(yè)數(shù): 26/66頁(yè)
文件大小: 460K
代理商: UPD75108A
μ
PD75104A, 75108A
26
5.7
PROGRAMMABLE THRESHOLD PORT (ANALOG INPUT PORT)
μ
PD75108A is equipped with a 4-bit analog input port (consisting of PTH00 to PTH03 pins) whose threshold
voltage is programmable. This programmable threshold port is configured as shown in Figure 5-6.
The threshold voltage (V
REF
) can be changed in 16 steps (V
DD
×
0.5/16 – V
DD
×
15.5/16), and analog signals can be
directly input.
When V
REF
is set to V
DD
×
7.5/16, the programmable threshold port can also be used as a digital signal input port.
Input buffer
PTH00
PTH01
PTH02
PTH03
+
+
+
+
V
DD
I
P
i
Operates
/stops
PTH0
8
4
MPX
PTHM7
PTHM6
PTHM5
PTHM4
PTHM3
PTHM2
PTHM1
PTHM0
PTHM
1
1
R
R
V
REF
Fig. 5-6 Programmable Threshold Port Configuration
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