44
User’s Manual U11969EJ3V0UM00
CHAPTER 2 PIN FUNCTIONS
(14) P140 to P147 (Port 14) ... 3-state I/O
Port 14 is an 8-bit I/O port that can be set in the input or output mode in 1-bit units. Port 14 functions only
as a port.
(15) CKSEL (Clock Select) ... input
This is the input pin that specifies the operation mode of the clock generation circuit. The input value of this
pin cannot be changed during normal operation.
CKSEL
Operation Mode
0
PLL mode
1
Direct mode
(16) PLLSEL (PLL Select) ... input
This is the input pin that specifies the number of PLL multiplication in the PLL mode (CKSEL = 0). The input
value of this pin cannot be changed during normal operation.
This pin has no function in the direct mode (CKSEL = 1) and should be treated as an unused pin.
PLLSEL
PLL Multiplication
0
Multiplication by 1
1
Multiplication by 5
(17) CLKOUT (Clock Output) ... output
This pin outputs the system clock, even during reset in the ROM-less mode. In the single-chip mode 1, the
CLKOUT signal is not output until the PSC register is set (low level output). However, in the single-chip mode
2, the CKOUT signal is output.
(18) WAIT (Wait) ... input
This control signal input pin inserts a data wait state to the bus cycle, and can be activated asynchronously
to CLKOUT. This pin is sampled at the falling edge of the clock in the T2 and TW states of the bus cycle.
If the set/hold time for the sampling timing is not satisfied, the wait state may not be inserted.
(19) MODE0 to MODE2 (Mode 0 to 2) ... input
These pins specify the operation mode of the V854. Operation modes are roughly classified as normal
operation mode and flash memory programming mode. Normal operation modes are further classified as
single-chip mode and ROM-less mode. The input value of these pins cannot be changed during normal
operation. For details, refer to 3.3 Operation Modes.
(a)
µ
PD703006
MODE2
MODE1
MODE0
Operation Mode
0
0
0
ROM-less mode 1
0
0
1
ROM-less mode 2
Other than above
Setting prohibited
Normal operation
mode
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 ...