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參數資料
| 型號： | HTG2190 |
| 廠商： | Holtek Semiconductor Inc. |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-Bit 1024 Pixel LCD Microcontroller |
| 中文描述： | 8位單片機1024像素LCD |
| 文件頁數： | 33/64頁 |
| 文件大?。?/td> | 417K |
| 代理商： | HTG2190 |
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HTG2190
Rev. 1.00
33
June 29, 2001
F1 can select 4 frequencies by mask option
Auto Mask Option
F0
System Clock near 512kHz
f
SYS
/16
System Clock near 1024kHz
f
SYS
/32
System Clock near 2048kHz
f
SYS
/64
System Clock near 4096kHz
f
SYS
/128
Time base frequency = T3f / (256
TMR3)
TMR3C Bit 4 to enable/disable timer counting
(0=disable; 1=enable)
TMR3C Bit6, always write "1"
TMR3C Bit7, always write "0"
TMR3C Bit 3, always write "0"
Timer 3 has the same structure and operating
manner with timer 2, except for clock source
and PFD function. The timer 3 can be used as a
time base to generate a regular internal inter-
rupt. The clock source of timer 3 can come from
RTC OSC (X'tal 32kHz) or system clock divided
by an 8-stage prescaler. If the RTC mask option
is enabled, a 32kHz crystal is needed to connect
across XIN and XOUT pins. The 32kHz signal
is processed by an 8-stage prescaler to generate
various counting clock for timer 3. There are
two registers related to timer 3; TMR3 (24H)
and TMR3C (25H). Writing data to B2, B1, B0
(bit 2, 1, 0 of TMR3C) can generate various
counting clock.
Input/output ports
There are 39 bidirectional input/output lines in
the HTG2190, labeled from PA to PE, which are
mapped to the data memory of [12H], [14H],
[16H], [18H], [1AH], respectively. All these I/O
ports can be used for input and output opera-
tions. For input operation, these ports are
non-latching, that is, the inputs must be ready
at the T2 rising edge of instruction MOV A,[m]
(m=12H, 14H, 16H, 18H, 1AH). For output op-
eration, all data is latched and remain un-
changed until the output latch is rewritten.
Each I/O line has its own control register (PAC,
PCC, PDC, PEC) which controls the input/out-
put configuration. With this control register,
CMOS output or Schmitt trigger input with or
without pull-high resistor structures can be re-
configured dynamically (i.e., on-the-fly) under
software control. To function as an input, the
corresponding latch of the control register must
write "1". The pull-high resistance will be ex-
hibited automatically if the pull-high option is
selected. The input source also depends on the
control register. If the control register bit is "1"
input will read the pad state. If the control reg-
ister bit is "0" the contents of the latches will
move to the internal bus. The latter is possible
in "read-modify-write" instruction. For output
function, CMOS is the only configuration.
These control registers are mapped to locations
13H, 15H, 17H, 19H, 1BH.
I
'
I
I
'
I
& *
,& &
#
& &
,
&
&
! & ,
@ 8 & < & - ! =
,
@
- - 8
2 1
* 5 & * . 2 * 1
2 1
2 1
2 1
@ &
@ &
Input/output ports
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