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參數(shù)資料
| 型號： | NS32FX100VF |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | System Controller |
| 中文描述： | 系統(tǒng)控制器 |
| 文件頁數(shù)： | 28/94頁 |
| 文件大?。?/td> | 955K |
| 代理商： | NS32FX100VF |
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2.0 Architecture
(Continued)
2.5.3 Registers
PBCFG: Printer Bitmap Shifter Configuration register.
7
2
1
0
res
SLNR
ECLK
ECLK:
External Clock. (NS32FX200 only.)
0 : Shift using an internal clock. Clock frequency
is selected by the printer bitmap internal clock
generator.
1 : Shift using an external clock.
The external clock must be frozen at least
four instructions after both DMA channel 1
and the Bitmap Shifter are enabled (i.e.,
MCFG.EPBMS
e
1).
Note:
Only the NS32FX200 supports operation using an
external clock. ECLK must always be cleared to
‘‘0’’ in the NS32FX100 and NS32FV100.
SLNR:
Shift direction.
0 : Shift right (LSB first)
1 : Shift left (MSB first)
PBCFG may not be written while MCFG.ETPHB
e
1. It
should be configured before printer activation.
PCLON:
Printer Bitmap Shifter internal clock (PCLK) high
time. 8-bit register.
PCLK is high for (PCLON
a
1) CTTL cycles.
PCLON
may
be
modified
MCFG.EPBMS
e
0.
PCLOFF: Printer Bitmap Shifter internal clock (PCLK) low
time. 8-bit register.
PCLK is low for (PCLOFF
a
1) CTTL cycles.
PCLOFF
may
be
MCFG.EPBMS
e
0.
TPHC:
Thermal Print-Head Control register.
only
when
modified
only
when
7
5
4
3
2
1
0
res
STBEN
PIS
SPOL
STBM
STBM:
Strobing mode (see Figure 2-12 and Figure
2-13).
00 : Four strobes
01 : Two strobes
10 : Reserved
11 : Reserved
SPOL:
Strobes polarity.
0 : Active low strobe-on
1 : Active high strobe-on
PIS:
Printer Interrupt Source.
0 : Strobes done interrupt pulse
1 : DMA channel 1 interrupt pulse
STBEN:
Strobes Enable.
Set by software to enable strobe generation on
strobe pins STB0–3. Automatically cleared by
hardware after the last strobe-on interval is com-
pleted. To avoid losing strobe pulses, verify that
this bit is cleared before setting it to ‘‘1’.
Upon reset the non-reserved bits of TPHC are cleared to
‘‘0’’.
STBON:
Strobe-On. 16-bit register.
The strobe-on interval is (STBON
a
1) MCLK
cycles.
STBOFF: Strobe-Off. 16-bit register.
The strobe-off interval is (STBOFF
a
1) MCLK
cycles.
PSTSL:
Printer Strobes Start Time Slot. 8-bit register.
Holds the time slot in which the strobe pulse train
starts.
PMTSL:
Printer Motor Time-Slot. 8-bit register.
Holds the time slot in which the Printer Motor In-
terrupt Pulse is generated. The interrupt pulse oc-
curs at the beginning of the specified time slot.
Note:
For an event to occur at the beginning of time slot n, the
relevant register (PSTSL or PMTSL) must be set to the
value n
a
1. If the written value equals the TSL value
the current time slot) then the event will occur either in
the next time slot, or after 257 time slots.
Example:
If a printer interrupt is to occur at the begin-
ning of time slot
Y
255 write the value ‘‘0’’ to PSTSL.
PDAC:
Printer PWM Pulse Width Modulation DAC.
7
6 5
0
res
PDAC
The PWM signal duty cycle is (PDAC
a
1)/64.
The signal width is zero when PDAC
e
3F.
PACMP:
Printer Analog Comparator Status. 8-bit register.
Read only.
Bit 0:
1 : DAC voltage
l
PTMP pin voltage.
0 : DAC voltage
k
PTMP pin voltage.
Bits 1–7: Reserved.
2.5.4 Usage Recommendations
1. Before activating the Printer, program the appropriate
Ports module registers PBDO, PBMS, PCDO, PCMS and
PCEN to connect the Printer module to the NS32FX100
I/O pins.
2. Completion of the Printer Bitmap Shifter operation is indi-
cated either through the STROBE-DONE interrupt or
through the DMA COUNTER-DONE status bit (STAT.TC
is set to ‘‘1’’). If indicated by the DMA STAT.TC bit, 32
additional bits must be explicitly shifted out of the Bitmap
Shifter, to complete the DMA transfer.
3. When TPHC.STBEN
e
0, strobes are still generated in-
ternally, hence the Strobes-done interrupt can still be
used even when strobes are disabled.
4. When using the Bitmap Shifter with an external clock the
operation must be carried out in the following order:
a. Initialize the ports module to work with the printer us-
ing an external clock (ports B and C).
5. Disable the strobes (TPHC.STBEN
e
0) before disabling
the TPH module (MCFG.ETPHB
e
0).
28
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PDF描述 |
|---|---|
| NS32FX200VF | System Controller |
| NS32FX210 | Facsimile/Data Modem Analog Front End (AFE) |
| NS32FX210J | Facsimile/Data Modem Analog Front End (AFE) |
| NS32FX210V | Facsimile/Data Modem Analog Front End (AFE) |
| NS32FX211V | Microprocessor Compatible Real Time C |
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