m3819 Renesas Electronics Corporation., m3819 Datasheet - Page 48

• Manufacturer Part Number: m3819
• Description: Mitsubishi 8-bit Single-chip Microcomputer 740 Family / 38000 Series
• Manufacturer: Renesas Electronics Corporation.

FLDC Mode Registers (FLDM 1, FLDM 2)
The FLDC mode register 1 (address 0036
ister 2 (address 0037
Fig. 28 Structure of FLDC mode register 1
Fig. 29 Structure of FLDC mode register 2
34
16
) are a seven bit register and an eight bit
b7
b7
16
) and FLDC mode reg-
0036
16
b0
b0
, 0037
FLDC mode register 1
(FLDM 1 : address 0036
T
T
(Setting of digit/segment OFF time)
Not used (returns “0” when read)
High-breakdown-voltage drivability selection bit
FLDC mode register 2
(FLDM 2 : address 0037
Automatic display control bit(P0, P1, P2
Display start bit
T
(digit time setting, at 8 MHz oscillation frequency)
Pl
Pl
scan
off
b1 b0
b5 b4 b3 b2
disp
0 0 0 0 : 1/16
0 0 : 0
0 1 : 1
1 0 : 2
1 1 : 3
0 0 0 1 : 2/16
0 0 1 0 : 3/16
0 0 1 1 : 4/16
0 1 0 0 : 5/16
0 1 0 1 : 6/16
0 1 1 0 : 7/16
0 1 1 1 : 8/16
1 0 0 0 : 9/16
1 0 0 1 : 10/16
1 0 1 0 : 11/16
1 0 1 1 : 12/16
1 1 0 0 : 13/16
1 1 0 1 : 14/16
1 1 1 0 : 15/16
1 1 1 1 : 16/16
0 : Strong drivability
1 : Weak drivability
16
b5 b4 b3 b2
0
1
0 : Ordinary mode
1 : Automatic display mode
0 : Display stopped
1 : Display in progress
0 0 0 0 : 128 s
0 0 0 1 : 256 s
0 0 1 0 : 384 s
0 0 1 1 : 512 s
0 1 0 0 : 640 s
0 1 0 1 : 768 s
0 1 1 0 : 896 s
0 1 1 1 : 1024 s
1 0 0 0 : 1152 s
1 0 0 1 : 1280 s
1 0 1 0
1 1 1 1
0 : Digit
1 : Segment
0 : Digit
1 : Segment
control bits
segment/digit switch bit
segment/digit switch bit
(display starts by writing “1” to this bit which is set to “0”)
control bits
control bits
register respectively which are used to control the FLD automatic
display and set the blanking time T
T
T
T
FLD digit interrupt (at rising edge of each digit)
Not available
disp
disp
disp
FLD blanking interrupt
(at falling edge of the last digit)
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
disp
disp
disp
disp
disp
disp
disp
disp
disp
disp
disp
disp
disp
disp
disp
disp
16
16
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
)
)
MITSUBISHI MICROCOMPUTERS
0
–P2
3
, P3, P8, P9, PA)
scan
for key-scan.
3819 Group