參數資料
型號: MC68HC08KH12A
廠商: 飛思卡爾半導體(中國)有限公司
英文描述: Microcontrollers
中文描述: 微控制器
文件頁數: 135/178頁
文件大?。?/td> 925K
代理商: MC68HC08KH12A
Port E
MC68HC08KH12A Data Sheet, Rev. 1.1
Freescale Semiconductor
135
12.6.3 Port-E Optical Interface Enable Register
Port E pins PTE3–PTE0, each has an optical coupling interface circuit which is specially built for optical
mouse application. Bits [1:0] of the Optical Interface Enable register enable or disable the interface circuit
in each port E pins PTE3–PTE0, whilst bits [7:2] define the reference level for the optical interface circuit
for optimum performance.
OIEX — Optical Interface Enable X.
This enables optical interface on PTE0 and PTE1 pins. It also enables the voltage divider circuit.
1 = PTE0 and PTE1 optical interface enabled.
0 = PTE0 and PTE1 optical interface disabled.
OIEY — Optical Interface Enable Y.
This enables optical interface on PTE2 and PTE3 pins. It also enables the voltage divider circuit.
1 = PTE2 and PTE3 optical interface enabled.
0 = PTE2 and PTE3 optical interface disabled.
XREF2–XREF0 — Reference Voltage Selection X
These bits sets the slicing reference voltage for optical interface associated with PTE0 and PTE1.
YREF2–YREF0 — Reference Voltage Selection Y
These bits sets the slicing reference voltage for optical interface associated with PTE2 and PTE3.
Address: $001C
Bit 7
6
5
4
3
2
1
Bit 0
Read:
YREF2
YREF1
YREF0
XREF2
XREF1
XREF0
OIEY
OIEX
Write:
Reset:
0
1
0
0
1
0
0
0
Figure 12-16. Optical Interface Enable Register E (EOIER)
XREF[2:0] / YREF[2:0]
PTE0-PTE1 / PTE2-PTE3
Reference Voltage (mV)
0
200
1
300
2
400
3
500
4
600
5
700
6
800
7
900
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