![NEC V854 UPD703006 Скачать руководство пользователя страница 152](http://html.mh-extra.com/html/nec/v854-upd703006/v854-upd703006_user-manual_249287152.webp)
152
User’s Manual U11969EJ3V0UM00
CHAPTER 6 CLOCK GENERATOR FUNCTION
6.7 Clock Output Control
The V854 can output CLKOUT signal which has the same frequency as that of the system clock and CLO signal
which is the frequency division of the system clock.
• CLKOUT signal =
φ
(system clock)
• CLO signal =
φ
,
φ
/2,
φ
/4,
φ
/8,
φ
/16
The V854 can also be used as a 1-bit output port.
6.7.1 Configuration
6.7.2 CLKOUT signal output control
The operation mode of the CLKOUT pin can be selected by the DCLK0 and DCLK1 bits of the PSC register.
By using this operation mode in combination with the HALT, IDLE, or software STOP mode, the power dissipation
can be effectively reduced (for how to write these bits, refer to 6.5.2 Control registers).
Clock output inhibit mode
The clock output from the CLKOUT pin is inhibited.
This mode is ideal for single-chip mode systems or systems that fetch instructions to external expansion devices
or asynchronously accesses data.
Because the operation of CLKOUT is completely stopped in this mode, the power dissipation can be minimized
and radiation noise from the CLKOUT pin can be suppressed.
(Fixed to low level)
L
CLKOUT
(normal mode)
CLKOUT
(clock output inhibit mode)
φ
φ
φ
φ
φ
LV
0
0
CLE
0
FS2
FS1
CL0
FS0
CLOM register
Selector 1
/2
/4
/8
/16
φ
Output control
Selector 2
CLKOUT
Содержание V854 UPD703006
Страница 2: ...2 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 22: ...22 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 80: ...80 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 134: ...134 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 156: ...156 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 294: ...294 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 320: ...320 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 324: ...324 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 336: ...336 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 376: ...376 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 382: ...382 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 394: ...394 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 396: ...396 User s Manual U11969EJ3V0UM00 MEMO ...