M37221M4H_15 Datasheet, PDF (54/114 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
P3 output mode control register
b7 b6 b5 b4 b3 b2 b1 b0
P3 output mode control register(P3S) [Address 00CD16]
B
Name
0 P30 output form
selection bit (P30S)
1 ^{P31 output form}
selection bit (P31S)
2 ^{DA1 output enable bit}
(DA1S)
3 ^{DA2 output enable bit}
(DA2S)
Functions
0: CMOS output
1: N-channel open-drain output
0: CMOS output
1: N-channel open-drain output
0: P30 input/output
1: DA1 output
After reset R W
0 RW
0 RW
0 RW
0: P31 input/output
1: DA2 output
0 ^RW
4 to 7
Nothing is assigned. These bits are write disable bits.
When these bits are read out, the values are “0.”
0
R—
Fig. 8.9.2 P3 output mode control register
DA conversion register i
b7 b6 b5 b4 b3 b2 b1 b0
0
DA conversion register i (i=1, 2) (DAi) [Addresses 00DE16, 00DF16]
B
Name
0 DA conversion
to selection bit
5 (DAi0 to DAi5)
Functions
b5 b4 b3 b2 b1 b0
0 0 0 0 0 0 : 0/64Vcc
0 0 0 0 0 1 : 1/64Vcc
0 0 0 0 1 0 : 2/64Vcc
After reset R W
0 RW
6 Fix this bit to “0.”
1 1 1 1 0 1 : 61/64Vcc
1 1 1 1 1 0 : 62/64Vcc
1 1 1 1 1 1 : 63/64Vcc
0
7 ^{Nothing is assigned. These bits are write disable bits.} 0
When these bits are read out, the values are “0.”
Note : When use M37221M4H/M6H/M8H/MAH-XXXSP/FP,
there is not this register. Fix to “ 0016.”
RW
R—
Fig. 8.9.3 DA conversion register i (i = 1, 2)
Rev.1.00 Oct 01, 2002 page 52 of 110
REJ03B0134-0100Z