参数资料
型号: UPD78F9212GR-JJG-A
厂商: Renesas Electronics America
文件页数: 153/175页
文件大小: 0K
描述: MCU 8BIT 4KB FLASH MEM 16-SSOP
标准包装: 1
系列: 78K0S/Kx1+
核心处理器: 78K0S
芯体尺寸: 8-位
速度: 10MHz
外围设备: LVD,POR,PWM,WDT
输入/输出数: 13
程序存储器容量: 4KB(4K x 8)
程序存储器类型: 闪存
RAM 容量: 128 x 8
电压 - 电源 (Vcc/Vdd): 2 V ~ 5.5 V
数据转换器: A/D 4x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 16-SSOP(0.173",4.40mm 宽)
包装: 托盘
其它名称: 972-1046
UPD78F9212GR-JJG-A-ND
CHAPTER 5 CLOCK GENERATORS
User’s Manual U16994EJ6V0UD
77
The fastest instruction of the 78K0S/KY1+ is executed in two CPU clocks. Therefore, the relationship between the
CPU clock (fCPU) and the minimum instruction execution time is as shown in Table 5-2.
Table 5-2. Relationship between CPU Clock and Minimum Instruction Execution Time
Minimum Instruction Execution Time: 2/fCPU
CPU Clock (fCPU)
Note
High-speed internal oscillation clock
(at 8.0 MHz (TYP.))
Crystal/ceramic oscillation clock
or external clock input (at 10.0 MHz)
fX
0.25
μs
0.2
μs
fX/2
0.5
μs
0.4
μs
fX/2
2
1.0
μs
0.8
μs
fX/2
3
2.0
μs
1.6
μs
fX/2
4
4.0
μs
3.2
μs
Note The CPU clock (high-speed internal oscillation clock, crystal/ceramic oscillation clock, or external clock
input) is selected by the option byte.
(2) Low-speed internal oscillation mode register (LSRCM)
This register is used to select the operation mode of the low-speed internal oscillator (240 kHz (TYP.)).
This register is valid when it is specified by the option byte that the low-speed internal oscillator can be stopped
by software.
If it is specified by the option byte that the low-speed internal oscillator cannot be stopped by
software, setting of this register is invalid, and the low-speed internal oscillator continues oscillating. In addition,
the source clock of WDT is fixed to the low-speed internal oscillator.
For details, refer to CHAPTER 8
WATCHDOG TIMER.
LSRCM can be set by using a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation sets LSRCM to 00H.
Figure 5-4. Format of Low-Speed internal oscillation Mode Register (LSRCM)
Address: FF58H, After reset: 00H, R/W
Symbol
7
6
5
4
3
2
1
<0>
LSRCM
0
LSRSTOP
Oscillation/stop of low-speed internal oscillator
0
Low-speed internal oscillates
1
Low-speed internal oscillator stops
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