參數(shù)資料
型號(hào): MC68HC11D3CFN2
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 133/138頁
文件大小: 1047K
代理商: MC68HC11D3CFN2
Programmable Timer
MC68HC711D3 Data Sheet, Rev. 2.1
94
Freescale Semiconductor
8.4.4 Output Compare 1 Data Register
Use this register with OC1 to specify the data that is to be stored on the affected pin of port A after a
successful OC1 compare. When a successful OC1 compare occurs, a data bit in OC1D is stored in the
corresponding bit of port A for each bit that is set in OC1M.
If OC1Mx is set, data in OC1Dx is output to port A bit x on successful OC1 compares.
Bits 2–0 — Not implemented; always read 0.
8.4.5 Timer Counter Register
The 16-bit read-only timer count register (TCNT) contains the prescaled value of the 16-bit timer. A full
counter read addresses the most significant byte (MSB) first. A read of this address causes the least
significant byte (LSB) to be latched into a buffer for the next CPU cycle so that a double-byte read returns
the full 16-bit state of the counter at the time of the MSB read cycle.
In normal modes, TCNT is read-only.
Address:
$000D
Bit 7
654321
Bit 0
Read:
OC1D7
OC1D6
OC1D5
OC1D4
OC1D3
0
Write:
Reset:
00000000
Figure 8-9. Output Compare 1 Data Register (OC1D)
Address: $000E — TCNT High
Bit 15
14
13
12
11
10
9
Bit 8
Read:
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 08
Write:
Reset:
00000000
Address: $000F — TCNT Low
Bit 7
654321
Bit 0
Read:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Write:
Reset:
00000000
= Unimplemented
Figure 8-10. Timer Counter Registers (TCNT)
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