Z51F3220FNX Datasheet, PDF (278/312 Pages) Zilog, Inc. – Z8051 Series 8-Bit Microcontrollers

Z51F3220
Product Specification
12.5.1 Register Map
Table 12-2 Power Down Operation Register Map
Name
PCON
Address
87H
Dir
Default
R/W
00H
Description
Power Control Register
12.5.2 Power Down Operation Register Description
The power down operation register consists of the power control register (PCON).
12.5.3 Register Description for Power Down Operation
PCON (Power Control Register) : 87H
7
6
5
4
3
2
1
0
PCON7
–
–
–
PCON3
PCON2
PCON1
PCON0
R/W
–
–
–
R/W
R/W
R/W
R/W
Initial value : 00H
PCON[7:0]
Power Control
01H
IDLE mode enable
03H
STOP mode enable
Other Values Normal operation
NOTES) 1. To enter IDLE mode, PCON must be set to ‘01H’.
2. To enter STOP mode, PCON must be set to ‘03H’.
3. The PCON register is automatically cleared by a release signal in STOP/IDLE mode.
4. Three or more NOP instructions must immediately follow the instruction that make the device enter
STOP/IDLE mode. Refer to the following examples.
Ex1)
MOV
NOP
NOP
NOP
•
•
•
PCON, #01H
; IDLE mode
Ex2)
MOV
NOP
NOP
NOP
•
•
•
PCON, #03H
; STOP mode
PS029902-0212
PRELIMINARY
276