
121
μ
PD75237
(2)
FIP controller/driver functions
The FIP controller/driver built in the
μ
PD75237 has the following functions:
(a)
Segment signal output (DMA operation) and automatic digit signal output are possible by automatic
read of display data.
(b)
The FIP with 9 to 24 segments and 9 to 16 digits (up to a total of 34 display outputs) can be controlled
using the display mode register (DSPM), digit select register (DIGS), static mode register A (STATA) and
static mode register B (STATB).
(c)
Output not used for dynamic display can be used for static output or output port.
(d)
8 brightness levels can be adjusted using the dimmer function.
(e)
Hardware is incorporated for key scan application.
Key scan interrupt (IRQKS) generation (key scan timing detection)
Key scan data output from segment output is possible with the key scan buffers (KS0, KS1 and KS2).
(f)
High-voltage output pin (40 V) capable of directly driving FIP.
Segment output pins (S0 to S9, S16 to S23) : V
OD
= 40 V, I
OD
= 3 mA
Digit output pins (T0 to T15) : V
OD
= 40 V, I
OD
= 15 mA
(g)
Display output pin mask option
T0 to T9 and S0 to S15 can incorporate a pull-down resistor in bit units to V
LOAD
.
S16 to S23 can incorporate a pull-down resistor in bit units to V
LOAD
or V
SS
. Determine in 8-bit units
whether a pull-down resistor should be incorporated to V
LOAD
or V
SS
.
(3)
Display output function differences between
μ
PD75237 and
μ
PD75216A/
μ
PD75217
Table 4-8 shows display output function differences between
μ
PD75237 and
μ
PD75216A/
μ
PD75217.
Table 4-8 Display Output Function Differences between
μ
PD75237 and
μ
PD75216A/
μ
PD75217
High-voltage output
display
FIP output total : 34 outputs
Segment output : 9 to 24 outputs
Digit output
: 9 to 16 outputs
FIP output total : 26 outputs
Segment output : 9 to 16 outputs
Digit output
: 9 to 16 outputs
1A0H to 1FFH
S0 to S23 (PORT10 to PORT15)
Display data area
Output dual-function pin
1C0H to 1FFH
KS0 to KS2
Key scan register
S12 to S15 (PORTH)
KS0, KS1
μ
PD75237
μ
PD75216A, 75217