參數(shù)資料
型號(hào): MC705JJ7CDWE
廠商: Freescale Semiconductor
文件頁數(shù): 10/164頁
文件大?。?/td> 0K
描述: IC MCU 8BIT 224B RAM 20-SOIC
標(biāo)準(zhǔn)包裝: 38
系列: HC05
核心處理器: HC05
芯體尺寸: 8-位
速度: 2.1MHz
連通性: SIO
外圍設(shè)備: POR,溫度傳感器,WDT
輸入/輸出數(shù): 14
程序存儲(chǔ)器容量: 6KB(6K x 8)
程序存儲(chǔ)器類型: OTP
RAM 容量: 224 x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 4x12b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 20-SOIC(0.295",7.50mm 寬)
包裝: 管件
Timer Registers
MC68HC705JJ7 MC68HC705JP7 Advance Information Data Sheet, Rev. 4.1
Freescale Semiconductor
107
11.2 Timer Registers
The functional block diagram of the 16-bit free-running timer counter and timer registers is shown in
Figure 11-2. The timer registers include a transparent buffer latch on the LSB of the 16-bit timer counter.
Figure 11-2. Programmable Timer Block Diagram
The timer registers (TMRH and TMRL) shown in Figure 11-3 are read-only locations which contain the
current high and low bytes of the 16-bit free-running counter. Writing to the timer registers has no effect.
Reset of the device presets the timer counter to $FFFC.
The TMRL latch is a transparent read of the LSB until a read of the TMRH takes place. A read of the
TMRH latches the LSB into the TMRL location until the TMRL is again read. The latched value remains
fixed even if multiple reads of the TMRH take place before the next read of the TMRL. Therefore, when
reading the MSB of the timer at TMRH, the LSB of the timer at TMRL must also be read to complete the
read sequence.
During power-on reset (POR), the counter is initialized to $FFFC and begins counting after the oscillator
startup delay. Because the counter is 16 bits and preceded by a fixed prescaler, the value in the counter
repeats every 262,144 internal bus clock cycles (524,288 oscillator cycles).
Address:
$0018
Bit 7
654321
Bit 0
Read:
Bit 15
14
13
12
11
10
9
Bit 8
Write:
Reset:
11111111
Address:
$0018
Bit 7
654321
Bit 0
Read:
Bit 7
654321
Bit 0
Write:
Reset:
11111100
= Unimplemented
Figure 11-3. Programmable Timer Registers (TMRH and TMRL)
TO
IE
TMRH ($0018)
TMR LSB
16-BIT COUNTER
÷ 4
INTERNAL
(OSC
÷ 2)
TIMER CONTROL REG.
TIMER
REQUEST
OVERFLOW (TOF)
RESET
CLOCK
INTERRUPT
TMRL ($0019)
TO
F
TIMER STATUS REG.
$0012
$0013
INTERNAL
$FFFC
DATA
READ
TMRH
READ
TMRL
READ
LATCH
BUS
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