HD404374 Datasheet, PDF (34/161 Pages) Renesas Technology Corp – Low-Voltage AS Microcomputers with On-Chip A/D Converter

HD404374/HD404384/HD404389/HD404082/HD404084 Series
Table 1 (2) Initial Values after MCU Reset
Item
Abbr.
Initial
value Contents
Serial
interface
Serial mode register 1
Serial mode register 2
(SMR1)
(SMR2)
0000
-0X-
See serial mode register 1 section
See serial mode register 2 section
Serial data register
(SRU,L) $XX
Octal counter
000
A/D
A/D mode register
converter _{A/D data register U}
(AMR)
(ADRU)
0000
0111
See A/D mode register section
See A/D data register section
A/D data register M
(ADRM)
1111
A/D data register L
(ADRL)
11- -
Bit
Low speed on flag
(LSON)
0
registers _{Watchdog timer on flag (WDON)}
0
See low-power mode section
See timer C section
A/D start flag
(ADSF)
0
See A/D converter section
Direct transfer on flag
(DTON)
0
See low-power mode section
Gear enable flag
(GEF)
0
See system clock gear function
Others Miscellaneous register (MIS)
0-00 See low-power mode and input/output sections
System clock select
register
(SSR)
0000 See low-power mode and oscillator circuit sections
Module standby register 1 (MSR1)
--00
See timer section
Module standby register 2 (MSR2)
--00
See serial interface and A/D converter sections
Notes: 1. The state of registers and flags other than those listed above after an MCU reset is shown in
table 1 (3).
2. X: Indicates invalid value, - indicates that the bit does not exist.
Table 1 (3) Initial Values after MCU Reset
Item
Abbr.
Carry flag
(CA)
Accumulator (A)
B register
(B)
W register
(W)
X/SPX register (X/SPX)
Y/SPY register (Y/SPY)
RAM
After Stop Mode Clearance by WU₀
Retain value immediately prior to
entering stop mode
After Other MCU Reset
Value immediately prior to MCU reset is not
guaranteed. Must be initialized by program.
Rev.5.00, Sep.11.2003, page 34 of 161