M37221M4H_15 Datasheet, PDF (106/114 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER

M37221M4H/M6H/M8H/MAH–XXXSP/FP M37221EASP/FP
Address 00ED16
OSD Clock Selection Register
b7 b6 b5 b4 b3 b2 b1 b0
000000
OSD clock selection register (CK) [Address 00ED16]
B
Name
Functions
After reset R W
0, 1 OSD clock b1 b0
Functions
selection bits _{0 0 The clock for display is supplied by connecting RC}
(CK0,CK1)
or LC across the pins OSC1 and OSC2.
0
RW
0 1 Since the main clock is used as the OSD oscillation
clock for display, the oscillation
frequency
frequency is limited. Because of this, = f(XIN)
the character size in width (horizontal)
1 0 _{direction is also limited. In this case,} OSD oscillation
pins OSC1 and OSC2 are also used ^frequency
as input ports P33 and P34 respectively. ^{= f(XIN)/1.5}
1 1 The clock for OSD is supplied by connecting the
following across the pins OSC1 and OSC2.
• a ceramic resonator only for OSD
• a quartz-crystal oscillator only for OSD and a
feedback resistor (See note)
2 to 7 Fix these bits to “0.”
0
RW
Note: It is necessary to connect other ceramic resonator or quartz-crystal oscillator for OSD across the pINs XIN and XOUT.
Addresses 00EE16
A-D Control Register 1
b7 b6 b5 b4 b3 b2 b1 b0
A-D control register 1 (AD1) [Address 00EE16]
B
Name
0 Analog input pin selection
to bits
2 (ADM0 to ADM2)
Functions
b2 b1 b0
0 0 0 : A-D1
0 0 1 : A-D2
0 1 0 : A-D3
0 1 1 : A-D4
1 0 0 : A-D5
1 0 1 : A-D6
1 1 0 : Do not set
1 1 1 : Do not set
After reset R W
0 _RW
3 This bit is a write disable bit.
When this bit is read out, the value is “0.”
0 _R—
4 Storage bit of comparison
result (ADM4)
0: Input voltage < reference voltage Indeterminate _{R —}
1: Input voltage > reference voltage
5 _{Nothing is assigned. This bits are write disable bits.}
to _{When these bits are read out, the values are “0.”}
7
0 _R—
Rev.1.00 Oct 01, 2002 page 104 of 110
REJ03B0134-0100Z