参数资料
型号: MC68HC05C12ACB
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP42
封装: SHRINK, PLASTIC, DIP-42
文件页数: 134/156页
文件大小: 756K
代理商: MC68HC05C12ACB
Serial Communications Interface (SCI)
SCI I/O Registers
MC68HC05C12A Rev. 3.0
General Release Specification
MOTOROLA
Serial Communications Interface (SCI)
79
NON-DISCLOSURE
AGREEMENT
REQUIRED
SCR2–SCR0 — SCI Baud Rate Select Bits
These read/write bits select the SCI baud rate, as shown in Table 9-
2. Reset has no effect on the SCR2–SCR0 bits.
Table 9-3 shows all possible SCI baud rates derived from crystal
frequencies of 2 MHz, 4 MHz, and 4.194304 MHz.
Table 9-1. Baud Rate Generator Clock Prescaling
SCP0–SCP1
Baud Rate Generator Clock
00
Internal Clock Divided by 1
01
Internal Clock Divided by 3
10
Internal Clock Divided by 4
11
Internal Clock Divided by 13
Table 9-2. Baud Rate Selection
SCR2–SCR0
SCI Baud Rate (Baud)
000
Prescaled Clock Divided by 1
001
Prescaled Clock Divided by 2
010
Prescaled Clock Divided by 4
011
Prescaled Clock Divided by 8
100
Prescaled Clock Divided by 16
101
Prescaled Clock Divided by 32
110
Prescaled Clock Divided by 64
111
Prescaled Clock Divided by 128
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