參數資料
型號: MC68HC05CT4FN
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.048 MHz, MICROCONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數: 134/142頁
文件大小: 624K
代理商: MC68HC05CT4FN
Dual Phase-Locked Loop (PLL)
Registers
MC68HC05CT4 Rev. 2.0
General Release Specification
MOTOROLA
Dual Phase-Locked Loop (PLL)
91
NON-DISCLOSURE
AGREEMENT
REQUIRED
11.3.4 16-Bit Receive Counter Modulus Register
This 2-byte register holds the count for the 16-bit receive counter. The
receive counter is shut off and held in reset when the RXON bit is
cleared. For proper operation, this register must not be loaded with a
value less than $000F.
The modulus registers mentioned above have specific read/write logic.
When the user updates the contents of the modulus registers, the MSB
must be written first and is temporarily stored in a temporary buffer. This
inhibits the transfer of data from this level to the next level, which is the
modulus register. When the LSB is written, all 12 or 16 bits (data from
the temporary buffer and the MCU internal bus) are transferred to the
modulus register simultaneously. This prevents the loading of bad data
from the modulus register. A read of the data registers is the reverse of
a write operation. A read of the LSB buffers the MSB. A subsequent read
of the MSB reflects this buffered value. Since only one temporary buffer
exists, two sequential MSB writes of different registers will result in only
the last data value stored in the temporary buffer. The first value will be
lost.
Address:
$000F
Bit 7
654321
Bit 0
Read:
PLLRX15 PLLRX14 PLLRX13 PLLRX12 PLLRX11 PLLRX10
PLLRX9
PLLRX8
Write:
Reset:
00000000
Address:
$0010
Bit 7
654321
Bit 0
Read:
PLLRX7
PLLRX6
PLLRX5
PLLRX4
PLLRX3
PLLRX2
PLLRX1
PLLRX0
Write:
Reset:
00000000
Figure 11-5. 16-Bit Receive Counter (PLLRX)
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