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參數(shù)資料
| 型號： | UPD75208CW |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCOMPUTER |
| 中文描述： | 4位單片機 |
| 文件頁數(shù)： | 22/62頁 |
| 文件大?。?/td> | 497K |
| 代理商： | UPD75208CW |
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22
μ
PD75208
5.8
FIP CONTROLLER/DRIVER
The on-chip FIP controller/driver has the following functions:
Generates the segment and digit signals by automatically reading the display data memory executing DMA
operation.
Can select up to a total of 26 display devices in the range of 9 to 12 segments and 9 to 16 digits.
Can apply the remaining display output as static output.
Can adjust the brightness at 8 levels using the dimmer function.
Can apply key scan operations.
Generates interrupt at the key scan timing (IRQKS)
Can generate key scan data output from the segment output pin.
Owns the high-voltage output pin (40 V) which can directly drive the FIP.
Segment special pins (S0 to S9) : V
OD
= 40 V, I
OD
= 3 mA
Digit output pins (T0 to T15)
: V
OD
= 40 V, I
OD
= 15 mA
Can incorporate pull-down resistors bit-wise as mask options.
Fig. 5-8 FIP Controller/Driver Block Diagram
Note
The FIP controller/driver can only operate in the high and intermediate-speeds (PCC = 0011B or 0010B) of
the main system clock (SCC.0 = 0). It may cause errors with any other clock or in the standby mode. Thus,
be sure to stop FIP controller operation (DSPM.3 = 0) and then shift the unit to any other clock mode or
the standby mode.
Dimmer
Select
Register
Digit
Select
Register
Display
Mode
Register
Key Scan
Flag (KSF)
IRQKS
Generation
Signal
Digit Signal Generator
Display Data Memory
(48
×
4 Bits)
Key Scan Registers
(KS0 and KS1)
12
Port H
Segment Data Latch (12)
10
4
2
2
2
2
Selector
V
PRE
T0-T9
T13/PH0-
T10/PH3
T15/S10 and
T14/S11
S0-S9
10
4
4
10
10
V
LOAD
Hige-Voltage Output Buffer
Internal Bus
4
4
4
4
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