M263 datasheet(285/398 Pages) NUVOTON

285 / 398 page

M261/M262/M263

Mar 25, 2020

Page 285 of 398

Rev 1.02

SRAM Power Control

SRAM bank0 and bank1 have marco retention and power shut down function. Each SRAM marco can

configured

retention

power

shut

down

mode

independently

SRAMxPMn

(SYS_SRAMPCTL[23:8], x=0-1 n=0-3). When chip entering power-down, each SRAM marco will enter

retention

power

shut

down

keep

operation

mode

depending

SRAMxPMn(SYS_SRAMPCTL[23:8], x=0-1 n=0-3).When chip power down wake up, SRAM marco

will wake up from retention or power shut down mode. User must identify which SRAM marco that

CPU first accessed for saving power down wake up time by STACK(SYS_SRAMPCTL[1:0]).

Figure 6.2-10 shows the SRAM marco number in bank0 and bank1. When chip power down wake up,

the first wake up SRAM marco is depened on STACK (SYS_SRAMPCTL[1:0]), the rest SRAM marcos

wake up in the order of marco number, from SRAM marco0 to SRAM marco7.

0x2000_0000

0x2000_4000

0x2000_8000

0x2000_6000

0x2000_C000

96 Kbytes device

16 Kbytes

SRAM Marco 7

16 Kbytes

SRAM Marco 6

16 Kbytes

SRAM Marco 5

16 Kbytes

SRAM Marco 4

8 Kbytes

SRAM Marco 3

8 Kbytes

SRAM Marco 2

8 Kbytes

SRAM Marco 1

8K byte

SRAM Marco 0

0x2000_2000

0x2001_0000

0x2001_4000

0x2001_7FFF

Figure 6.2-10 SRAM Marco Organization

6.2.8

Auto Trim

This chip supports auto-trim function: the HIRC trim (12 MHz RC oscillator, 48 MHz RC oscillator),

according to the accurate external 32.768 kHz crystal oscillator or internal USB synchronous mode, to

automatically get accurate HIRC output frequency, 0.25 % deviation within all temperature ranges.

For instance, the system needs an accurate 12 MHz clock. In such case, if neither using PLL as the

system clock source nor soldering 32.768 kHz crystal in system, user has to set REFCKSEL

(SYS_TCTL12M[10] reference clock selection) to

“1”, set FREQSEL (SYS_TCTL12M[1:0] trim

frequency selec

tion) to “01”, and the auto-trim function will be enabled. Interrupt status bit FREQLOCK

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