TMP91C824
91C824-239
(5)
Clock Gear (1/2)
Symbol
Name
Address
7
6
5
4
3
2
1
0
XEN
XTEN
RXEN
RXTEN
RSYSCK
WUEF
PRCK1
PRCK0
R/W
1
0
1
0
0
0
0
0
SYSCR0
System Clock
Control Register
0
E0H
High-
frequency
oscillator (fc)
0: stopped
1: oscillation
Low-
frequency
oscillator (fs)
0: stopped
1: oscillation
High-frequenc
y oscillator (fc)
after release
of STOP Mode
0: stopped
1: oscillation
Low-frequenc
y oscillator (fs)
after release of
STOP Mode
0: stopped
1: oscillation
Select clock
after release of
STOP Mode
0: fc
1: fs
Warm-up
timer
0 write:
Don’t care
1 write:
start timer
0 read: end
warm-up
1 read:
not end
warm-up
Select prescaler clock
00: fFPH
01: reserved
10: fc/16
11: reserved
SYSCK
GEAR2
GEAR1
GEAR0
R/W
0
1
0
0
SYSCR1
System Clock
Control
Register 1
E1H
System
clock
selection
0: fc
1: fs
(Note 2)
High-frequency gear value selection
(fc)
000: fc
001: fc/2
010: fc/4
011: fc/8
100: fc/16
101: (reserved)
110: (reserved)
111: (reserved)
SCOSEL
WUPTM1
WUPTM0
HALTM1
HALTM0
DRVE
R/W
R/W
R/W
R/W
R/W
R/W
0
1
0
1
1
0
SYSCR2
System Clock
Control
Register 2
E2H
0: fs
1: f
FPH
Warming-up time
00: reserved
01: 2
8
/inputt frequency
10: 2
14
11: 2
16
00: reserved
01: STOP Mode
10: IDLE1 Mode
11: IDLE2 Mode
<Drive>
Mode
Select
0:STOP
1:IDLE
1: Drive the
pin in
STOP /
IDLE1
Mode