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參數(shù)資料
| 型號(hào)： | UPD75237GJ |
| 廠商： | NEC Corp. |
| 英文描述： | TRANSISTOR NPN 800MA 45V SOT23 |
| 中文描述： | 4位單片機(jī) |
| 文件頁(yè)數(shù)： | 119/191頁(yè) |
| 文件大?。?/td> | 1255K |
| 代理商： | UPD75237GJ |
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119
μ
PD75237
4.11 BIT SEQUENTIAL BUFFER : 16 BITS
The bit sequential buffer (BSB0 to BSB3) is a special data memory for bit manipulation.
Since this buffer can easily carry out bit manipulation by sequentially changing address and bit specification,
it is useful to process data having long bit lengths in bit units.
This data memory consists of 16 bits and can execute the pmem.@L addressing of bit manipulation instructions.
Thus, it can indirectly specify bits with the L register. In this case, processing can be carried out by sequentially
shifting the specified bit by simply incrementing/decrementing the L register in the program loop.
Fig. 4-67 Bit Sequential Buffer Format
Remarks
In pmem.@L addressing, the specified bit shifts in accordance with the L register. The bit sequential
buffer can be operated irrespective of MBE or MBS specification.
Data manipulation is also possible by direct addressing. 1-, 4- and 8-bit direct addressing can be combined with
pmem.@L addressing for applications to continuous 1-bit data input/output. In the case of 8-bit manipulation, the
most and least significant 8 bits each are manipulated by specifying BSB0 and BSB2, respectively.
4.12 FIP CONTROLLER/DRIVER
(1)
FIP controller/driver configuration
The
μ
PD75237 incorporates a display controller which automatically generates the digit and segment
signals by reading the display data memory contents by carrying out DMA operation and a high-voltage output
buffer which can directly drive the fluorescent display tube (FIP). The FIP controller/driver configuration is
shown in Fig. 4-68.
Note
The FIP controller/driver can only operate at high and intermediate speeds (PCC = 0011B or 0010B) of the
main system clock (SCC.0 = “0”). It may malfunction 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.
BSB3
BSB2
BSB1
BSB0
FC3H
FC2H
FC1H
FC0H
3
2
1
0
3
2
1
0
3
2
1
0
3
2
1
0
Address
Bit
Symbol
L=F
L Register
L=C L=B
L=7
L=8
L=3
L=4
L=0
DECS L
INCS L
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