参数资料
型号: MC68HC705C9ACP
厂商: Freescale Semiconductor
文件页数: 29/118页
文件大小: 0K
描述: IC MCU 2.1MHZ 16K OTP 40-DIP
标准包装: 9
系列: HC05
核心处理器: HC05
芯体尺寸: 8-位
速度: 2.1MHz
连通性: SCI,SPI
外围设备: POR,WDT
输入/输出数: 24
程序存储器容量: 16KB(16K x 8)
程序存储器类型: OTP
RAM 容量: 352 x 8
电压 - 电源 (Vcc/Vdd): 3 V ~ 5.5 V
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 40-DIP(0.600",15.24mm)
包装: 管件
General Description
MC68HC05C9A Advance Information Data Sheet, Rev. 4.1
18
Freescale Semiconductor
1.5 Software-Programmable Options (MC68HC05C9A Mode Only)
The C9A option register (OR), shown in Figure 1-4, is enabled only if configured in C9A mode. This
register contains the programmable bits for the following options:
Map two different areas of memory between RAM and EPROM, one of 48 bytes and one of 128
bytes
Edge-triggered only or edge- and level-triggered external interrupt (IRQ pin and any port B pin
configured for interrupt)
This register must be written to by user software during operation of the microcontroller.
RAM0 — Random Access Memory Control Bit 0
This read/write bit selects between RAM or EPROM in location $0020 to $004F. This bit can be read
or written at any time.
1 = RAM selected
0 = EPROM selected
RAM1— Random Access Memory Control Bit 1
This read/write bit selects between RAM or EPROM in location $0100 to $017F. This bit can be read
or written at any time.
1 = RAM selected
0 = EPROM selected
IRQ — Interrupt Request Bit
This bit selects between an edge-triggered only or edge- and level- triggered external interrupt pin.
This bit is set by reset, but can be cleared by software. This bit can be written only once.
1 = Edge and level interrupt option selected
0 = Edge-only interrupt option selected
$3FDF
Bit 7
654321
Bit 0
Read:
RAM0
RAM1
IRQ
Write:
Reset:
00000010
= Unimplemented
Figure 1-4. C9A Option Register
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