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型號(hào)：	UPD780076
廠商：	NEC Corp.
元件分類：	8位微控制器
英文描述：	8-Bit Single-Chip Microcontrollers
中文描述：	8位單芯片微控制器
文件頁(yè)數(shù)：	140/592頁(yè)
文件大?。?/td>	3307K
代理商：	UPD780076

CHAPTER 7 CLOCK GENERATOR

s Manual U14260EJ3V1UD

7.5.2 Subsystem clock operations

When operating with the subsystem clock (with bit 5 (CLS) of the processor clock control register (PCC) set to

1), the following operations are carried out.

(a) The minimum instruction execution time remains constant (122

s @ 32.768 kHz operation) irrespective of bits

0 to 2 (PCC0 to PCC2) of PCC.

(b) Watchdog timer counting stops.

Do not execute the STOP instruction while the subsystem clock is in operation.

7.6 Changing System Clock and CPU Clock Settings

7.6.1 Time required for switchover between system clock and CPU clock

The system clock and CPU clock can be switched over by means of bits 0 to 2 (PCC0 to PCC2) and bit 4 (CSS)

of the processor clock control register (PCC).

The actual switchover operation is not performed directly after writing to the PCC; operation continues on the pre-

switchover clock for several instructions (see

Determination as to whether the system is operating on the main system clock or the subsystem clock is performed

by bit 5 (CLS) of the PCC register.

Table 7-3. Maximum Time Required for CPU Clock Switchover

One instruction is the minimum instruction execution time with the pre-switchover CPU clock.

Selection of the CPU clock cycle division ratio (PCC0 to PCC2) and switchover from the main

system clock to the subsystem clock (changing CSS from 0 to 1) should not be set simultaneously.

Simultaneous setting is possible, however, for selection of the CPU clock cycle division ratio

(PCC0 to PCC2) and switchover from the subsystem clock to the main system clock (changing

CSS from 1 to 0).

Set Value Before

Set Value After Switchover

CSS PCC2 PCC1 PCC0 CSS PCC2 PCC1 PCC0 CSS PCC2 PCC1 PCC0 CSS PCC2 PCC1 PCC0 CSS PCC2 PCC1 PCC0 CSS PCC2 PCC1 PCC0 CSS PCC2 PCC1 PCC0

16 instructions

8 instructions

4 instructions

2 instructions

1 instruction

1 instruction

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相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
UPD780101MC-047-5A4-E1-A	制造商:Renesas Electronics Corporation 功能描述:
UPD780102MC-082-5A4-A	制造商:Renesas Electronics Corporation 功能描述:
UPD780102MC-083-5A4-A	制造商:Renesas Electronics Corporation 功能描述:
UPD780134GK-424-9ET-E3-A	制造商:Renesas Electronics Corporation 功能描述:
UPD78014GC-765-AB8	制造商:NEC Electronics Corporation 功能描述:

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