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參數(shù)資料
| 型號(hào)： | HT49R50A |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | 8-Bit High Performance High speed Microcontroller(8位、高性能、高速微控制器) |
| 中文描述： | 8位高性能高速微控制器（8位，高性能，高速微控制器） |
| 文件頁數(shù)： | 24/51頁 |
| 文件大小： | 320K |
| 代理商： | HT49R50A |
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HT49R50A
24
November 29, 2000
Label
(TMR1C)
Bits
Function
0~2
Unused bits, read as "0"
TE
3
To define the TMR1 active edge of timer/event counter
(0= active on low to high; 1= active on high to low)
TON
4
To enable/disable timer counting
(0= disabled; 1= enabled)
TN2
5
2to1multiplexercontrolinputstoselectthetimer/eventcounterclocksource
(0= options clock source; 1= system clock/4)
TN1
TN0
7
6
To define the operating mode
01= Event count mode (External clock)
10= Timer mode (Internal clock)
11= Pulse Width measurement mode (External clock)
00= Unused
TMR1C register
preload register. The timer/event counter still
continues its operation until anoverflowoccurs.
When the timer/event counter (reading
TMR0/TMR1) is read, the clock is blocked to
avoid errors. As this may results in a counting
error, blocking of the clock should be taken into
account by the programmer.
It is strongly recommended to load a desired
value into the TMR0/TMR1 register first, then
turn on the related timer/event counter for
proper operation. Because the initial value of
TMR0/TMR1 is unknown.
Due to the timer/event scheme, the program-
mershouldpayspecialattentionontheinstruc-
tion to enable then disable the timer for the
first time, whenever there is a need to use the
timer/event function, to avoid unpredictable re-
sult. After this procedure, the timer/event func-
tion can be operated normally. The example
given below, using two 8-bit width Timer s
(timer 0 ;timer 1) cascade into 16-bit width.
START:
mov a,09h
mov intc0,a
; Set ET0I&EMI bits to
; enable timer 0 and
; global interrupt
; Set ET1I bit to enable
; timer 1 interrupt
; Set operating mode as
mov a,01h
mov intc1, a
mov a, 80h
mov tmr1c,a
; timer mode and select mask
; option clock source
;Setoperatingmodeastimer
; mode and select system
; Clock/4
mov a,0a0h
mov tmr0c, a
set
clr
tmr1c.4
tmr1c.4
; Enable then disable timer 1
; for the first time
mov a, 00h
mov tmr0, a
mov a, 00h
mov tmr1, a
; Load a desired value into
; the TMR0/TMR1 register
;
;
set
set
tmr0c.4
tmr1c.4
; Normal operating
;
END
Input/output ports
There are a 12-bit bidirectional input/output
port, an 8-bit input port in the HT49R50A, la-
beled PA, PB and PC which are mapped to
[12H], [14H] and [16H] of the RAM, respec-
tively. PA0~PA3 can be configured as CMOS
(output) or NMOS (input/output) with or
without pull-high resistor by options. PA4~PA7
are always pull-high and NMOS (input/output).
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相關(guān)代理商/技術(shù)參數(shù) |
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| HT49R50A-1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit LCD Type OTP MCU |
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| HT49R70A-1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit LCD Type OTP MCU |
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