ez80f91 ZiLOG Semiconductor, ez80f91 Datasheet - Page 280

• Manufacturer Part Number: ez80f91
• Description: Ez80 Acclaimplus!? Connectivity Assp Ez80f91 Assp
• Manufacturer: ZiLOG Semiconductor

Table 152. PLL Divider Register—Low Bytes
PS027001-0707
Bit
Reset
CPU Access
Note: W = Write only.
Bit
Position
[7:0]
PLL_DIV_L
Note:
Power Requirement to the Phase-Locked Loop Function
PLL Registers
Regardless of whether or not you chooses to use the PLL module block as a clock source
for the eZ80F91 device, the PLL_V
the PLL_V
eZ80F91 using any system clock source.
PLL Divider Control Register—Low and High Bytes
This register is designed such that the 11 bit divider value is loaded into the divider mod-
ule whenever the PLL_DIV_H register is written. Therefore, the procedure must be to
load the PLL_DIV_L register, followed by the PLL_DIV_H register, for the divider to
receive the appropriate value.
The divider is designed such that any divider value less than two is ignored; a value of two
is used in its place.
The least-significant byte of PLL divider N is set via the corresponding bits in the
PLL_DIV_L register. See
The PLL divider register are written only when the PLL is disabled. A read-back of the
PLL Divider registers returns 0.
Value
00h–FFh These bits represent the Low byte of the 11 bit PLL divider
SS
W
7
0
Description
value. The complete PLL divider value is returned by
{PLL_DIV_H, PLL_DIV_L}.
(pin 84) must be connected to a V
W
6
0
Table 152
W
5
0
DD
W
4
0
(PLL_DIV_L = 005Ch)
and
(pin 87) must be connected to a V
Table 153
W
3
0
SS
supply for proper operation of the
on page 273.
W
2
0
W
1
1
Product Specification
W
0
0
Phase-Locked Loop
eZ80F91 ASSP
DD
supply and
272