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7220 bảng dữ liệu(PDF) 263 Page - Renesas Technology Corp

tên linh kiện 7220
Giải thích chi tiết về linh kiện  8-BIT SINGLE-CHIP MICROCOMPUTER
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nhà sản xuất  RENESAS [Renesas Technology Corp]
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APPENDIX
6.7 Control registers
7220 Group User’s Manual
6-44
Fig. 6.7.21 CRT clock selection register
Address 00ED16
b7 b6 b5 b4 b3 b2 b1 b0
CRT clock selection register (CK) [Address 00ED
B
Name
Functions
After reset R W
CRT Clock Selection Register
0, 1 CRT clock
selection bits
(CK0,CK1)
0
Since the main clock is used as the clock for
display, the oscillation frequency is limited.
Because of this, the character size in width
(horizontal) direction is also limited. In this
case, pins OSC1 and OSC2 are also used
as input ports P33 and P34 respectively.
The clock for display is supplied by connecting the
following across the pins OSC1 and OSC2.
• a ceramic resonator only for CRT display and a feedback resistor
• a quartz-crystal oscillator only for CRT display and a feedback
resistor (Note)
2
to
7
0
0
0
0
0
0
0
b1
The clock for display is supplied by connecting RC
or LC across the pins OSC1 and OSC2.
Functions
10
b0
CRT oscillation
frequency
= f(XIN)
CRT oscillation
frequency
= f(XIN)/1.5
Note: It is necessary to connect other ceramic resonator or quartz-crystal oscillator across the pins X
0
0
1
1
1
1
Fix these bits to “0.”
IN
and XOUT.
16
]
RW
RW



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