參數(shù)資料
型號: MC68HC05JB3JP
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDIP20
封裝: PLASTIC, DIP-20
文件頁數(shù): 4/148頁
文件大?。?/td> 1600K
代理商: MC68HC05JB3JP
November 5, 1998
GENERAL RELEASE SPECIFICATION
MC68HC05JB3
OPTICAL INTERFACE
MOTOROLA
REV 1
11-1
SECTION 11
OPTICAL INTERFACE
The MC68HC05JB3 MCU has four pairs of Optical Interfaces, congured through
Port-A. This port has built-in optical coupler interface devices, which can be
directly connected to IR displacement encoders, such as in optical mouse and
optical joystick applications.
11.1
OVERVIEW
In practical designs, each axis requires two optical couplers to detect the displace-
ment. Hence, the eight optical interfaces on port-A are enabled in pairs, with each
pair enabled by a bit in the Optical Interface Enable Register ($0E). Figure 11-1
shows a one pair of the optical interface. Table 11-1 shows the port-A congura-
tion for the four pairs.
Table 11-1. Port-A Optical Interface Pairs
For optimal performance, the reference voltage used in the optical interface
module is selectable from eight predened values, as shown in Figure 11-2. and
Table 11-2. This allows the optical interface to be easily congured by software to
match the IR displacement encoders. The reference voltage is selected using the
bits VREF0-VREF2 in the OIER.
Optical Coupler
Port pin used
Enable bit in OIER
Pair 1
PA0 and PA1
OIE0
Pair 2
PA2 and PA3
OIE1
Pair 3
PA4 and PA5
OIE2
Pair 4
PA6 and PA7
OIE3
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