Cgsyscr] (System Clock Control Register) - Toshiba TXZ+ TMPM4KLFYAUG Reference Manual

Note3: When using the oscillator connection, set this bit to "01" (external high speed oscillator).
Note4: To wait stabilizing oscillation of an internal high speed oscillator1 (IHOSC1), use a warming-up timer
and confirm [CGWUPHCR]<WUEF> instead of <IHOSC1F>.

1.4.2.3. [CGSYSCR] (System clock control register)

Bit Bit Symbol
31:30 MCKSELPST[1:0]
29:28 -
27:24 PRCKST[3:0]
23:22 MCKSELGST[1:0]
21:19 -
18:16 GEARST[2:0]
15:12 -
11:8 PRCK[3:0]
7:6 MCKSEL[1:0]
5:3 -
2:0 GEAR[2:0]
After reset Type
Middle speed prescaler clock (ΦT0m) selection status
00: <PRCK[3:0]> setting value (no division)
00 R
01: <PRCK[3:0]> setting value is divided by 2
10,11: <PRCK[3:0]> setting value is divided by 4
0 R Read as "0"
High speed prescaler clock (ΦT0h) selection status
0000: fc
0000 R
0001: fc/2
0010: fc/4
0011: fc/8
Middle speed system clock (fsysm) selection status
00: <GEAR[2:0]> setting value (no division)
00 R
01: <GEAR[2:0]> setting value is divided by 2
10,11: <GEAR[2:0]> setting value is divided by 4
0 R Read as "0"
High speed system clock (fsysh) gear selection status
000: fc
000 R
001: fc/2
010: fc/4
011: fc/8
0 R Read as "0"
High speed prescaler clock (ΦT0h) selection
0000: fc
0001: fc/2
0000 R/W
0010: fc/4
0011: fc/8
Selects a prescaler clock for the peripheral functions.
Middle speed system clock (fsysm) and Middle speed prescaler
clock (ΦT0m) selection
00: <GEAR[2:0]>, <PRCK[3:0]> setting values (no division)
00 R/W 01: <GEAR[2:0]>, <PRCK[3:0]> setting values are divided by 2.
10,11: <GEAR[2:0]>,<PRCK[3:0]> setting values are divided by 4.
Maximum operating frequency of middle speed system clock is
80MHz.
0 R Read as "0"
High speed system clock (fsysh) gear selection
000: fc
000 R/W
001: fc/2
010: fc/4
011: fc/8
32 / 68
Clock Control and Operation Mode
Function
0100: fc/16 1000: fc/256
0101: fc/32 1001: fc/512
0110: fc/64 1010 to 1111: Reserved
0111: fc/128
100: fc/16
101 to 111: Reserved
0100: fc/16 1000: fc/256
0101: fc/32 1001: fc/512
0110: fc/64 1010 to 1111: Reserved
0111: fc/128
100: fc/16
101 to 111: Reserved
TXZ+ Family
TMPM4K Group(2)
2023-12-25
Rev. 3.0