参数资料
型号: M34518E8SP
元件分类: 微控制器/微处理器
英文描述: 4-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PDIP32
封装: 8.90 X 28 MM, 1.78 MM PITCH, PLASTIC, SDIP-32
文件页数: 133/162页
文件大小: 1149K
代理商: M34518E8SP
Rev.3.01
2005.06.15
page 70 of 157
REJ03B0008-0301
4518 Group
ROM ORDERING METHOD
1.Mask ROM Order Confirmation Form
2.Mark Specification Form
3.Data to be written to ROM, in EPROM form (three identical cop-
ies) or one floppy disk.
For the mask ROM confirmation and the mark specifications, re-
fer to the “Renesas Technology Corp.” Homepage
(http://www.renesas.com/en/rom).
(7) Clock control register MR
Register MR controls system clock. Set the contents of this register
through register A with the TMRA instruction. In addition, the TAMR
instruction can be used to transfer the contents of register MR to
register A.
Table 22 Clock control registers
Note: “R” represents read enabled, and “W” represents write enabled.
MR3
Clock control register MR
Operation mode
Through mode (frequency not divided)
Frequency divided by 2 mode
Frequency divided by 4 mode
Frequency divided by 8 mode
Main clock (f(XIN)) oscillation enabled
Main clock (f(XIN)) oscillation stop
Main clock (f(XIN))
Main clock (f(RING))
at reset : 11112
at RAM back-up : 11112
MR3
0
1
R/W
TAMR/
TMRA
Main clock f(XIN) oscillation circuit control bit
System clock oscillation source selection bit
Operation mode selection bits
0
1
0
1
MR2
0
1
0
1
MR1
MR0
MR2
0
1
On-chip oscillator (f(RING)) oscillation enabled
On-chip oscillator (f(RING)) oscillation stop
On-chip oscillator (f(RING)) control bit
Clock control register RG
W
TRGA
at RAM back-up : 02
at reset : 02
RG0
(8) Clock control register RG
Register RG controls start/stop of on-chip oscillator. Set the con-
tents of this register through register A with the TRGA instruction.
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