參數(shù)資料
型號(hào): UPD7566ACSA
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): 20/58頁
文件大小: 471K
代理商: UPD7566ACSA
μ
PD7566A, 7566A(A)
20
2.10 CLOCK CONTROL CIRCUIT
The clock control circuit consists of a 2-bit clock mode register (made up of bits CM2 and 1), three prescalers
(1, 2, and 3), and a multiplexer. This circuit inputs the output from the system clock generator (i.e., CL). An event
pulse (from pin P00) selects a clock source and prescaler, as specified by the clock mode register, and supplies a
count pulse (CP) to the timer/event counter.
Fig. 2-10 Clock Control Circuit
Note
indicates that an instruction has been executed.
A code is set in the clock mode register by an OPL (L = 12) instruction.
Fig. 2-11 Clock Mode Register Format
CM2
CM1
Clock mode register
CM2
0
0
1
1
CM1
0
1
0
1
Count pulse frequency (CP)
CL x 1/256
P00
CL x 1/32
CL x 1/4
Caution
When setting a code in the clock mode register by the OPL instruction, be sure to clear the bit 0 (which
corresponds to CM0 of EVAKIT-7500B (
μ
PD7500) during emulation) for the accumulator to 0.
CM1
CM2
OPL
CP
Internal Bus
P
00
PRESCALER 1
(1/4)
CL
PRESCALER 2
(1/8)
PRESCALER 3
(1/8)
Note
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