參數(shù)資料
型號: UPD7554ACS
廠商: NEC Corp.
英文描述: 4-BIT SINGLE-CHIP MICROCOMPUTER
中文描述: 4位單片機(jī)
文件頁數(shù): 21/64頁
文件大小: 991K
代理商: UPD7554ACS
21
μ
PD7554A, 7554A(A)
2.10 CLOCK CONTROL CIRCUIT
The clock control circuit consists of 2-bit clock mode registers (CM2 and CM1), prescalers 1, 2 and 3, and a
multiplexer. The circuit inputs the system clock generator output (CL) and the event pulse (P00). It also selects a
clock source and a prescaler according to the specifications of clock mode register and supplies a count pulse (CP)
to the timer/event counter.
Fig. 2-10 Clock Control Circuit
CP
CL
P00
PRESCALER 1
(1/4)
PRESCALER 2
(1/8)
PRESCALER 3
(1/8)
OPL
Note
CM2 CM1
Internal Bus
Note
Instruction execution
Use the OPL instruction to set codes in the clock mode registers.
Fig. 2-11 Clock Mode Register Format
Clock Mode Register
Caution
When setting codes in the clock mode registers using the OPL instruction, be sure to set bit 0 of the
accumulator to 0. (Bit 0 corresponds to CM0 of the
μ
PD7500 of EVAKIT-7500B in emulation.)
CM2
CM1
CM2
CM1
Count Pulse Frequency (CP)
0
0
CL
×
1
256
0
1
P00
1
0
CL
×
1
32
1
1
CL
×
1
4
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